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Katherine　looked　rather　astonished。　〃I　don't　think　so；〃　she　said。　Poirot　drew　from　his　pocket　a　cigarette　case　of　soft　blue　leather；　with　the　initial　〃K〃　on　it　in　gold。　

〃No；　that　is　not　mine；〃　Katherine　said。　

〃Ah；　a　thousand　apologies。　It　was　doubtless　Madame's　own。　'K'　of　course；　stands　for　Kettering。　We　were　doubtful；　because　she　had　another　cigarette　case　in　her　bag；　and　it　seemed　odd　that　she　should　have　two。〃　

He　turned　to　Derek　suddenly。　〃You　do　not　know；　I　suppose；　whether　this　was　your　wife's　case　or　not？〃　

Derek　seemed　momentarily　taken　aback。　He　stammered　a　little　in　his　reply：　〃I　…　I　don't　know。　I　suppose　so。〃　

〃It　is　not　yours　by　any　chance？〃　

〃Certainly　not。　If　it　were　mine　it　would　hardly　have　been　in　my　wife's　possession。〃　

Poirot　looked　more　ingenuous　and　childlike　than　ever。　

〃I　thought　perhaps　you　might　have　dropped　it　when　you　were　in　your　wife's　partment；〃　he　explained　guilelessly。　

〃I　never　was　there。　I　have　already　told　the　police　that　a　dozen　times。〃　

〃A　thousand　pardons；〃　said　Poirot；　with　his　most　apologetic　air。　〃It　was　Mademoiselle　here　who　mentioned　having　seen　you　going　in。〃　

He　stopped　with　an　air　of　embarrassment。　

Katherine　looked　at　Derek。　His　face　had　gone　rather　white；　but　perhaps　that　was　her　fancy。　His　laugh；　when　it　came；　was　natural　enough。　

〃You　made　a　mistake；　Miss　Grey；〃　he　said　easily。　〃From　what　the　police　have　told　me；　I　gather　that　my　own　partment　was　only　a　door　or　two　away　from　that　of　my　wife's　…　though　I　never　suspected　the　fact　at　the　time。　You　must　have　seen　me　going　into　my　own　partment。〃　He　got　up　quickly　as　he　saw　Van　Aldin　and　Knighton　approaching。　

〃I'm　going　to　leave　you　now；〃　he　announced。　〃I　can't　stand　my　father…in…law　at　any　price。〃　

Van　Aldin　greeted　Katherine　very　courteously；　but　was　clearly　in　a　bad　humour。　

〃You　seem　fond　of　watching　tennis；　M。　Poirot；〃　he　growled。　

〃It　is　a　pleasure　to　me；　yes；〃　cried　Poirot　placidly。　

〃It　is　as　well　you　are　in　France；〃　said　Van　Aldin。　〃We　are　made　of　sterner　stuff　in　the　States。　Business　es　before　pleasure　there。〃　

Poirot　did　not　take　offence；　indeed；　he　smiled　gently　and　confidingly　at　the　irate　millionaire。　

〃Do　not　enrage　yourself；　I　beg　of　you。　Everyone　has　his　own　methods。　Me；　I　have　always　found　it　a　delightful　and　pleasing　idea　to　bine　business　and　pleasure　together。〃　

He　glanced　at　the　other　two。　They　were　deep　in　conversation；　absorbed　in　each　other。　Poirot　nodded　his　head　in　satisfaction；　and　then　leant　towards　the　millionaire；　lowering　his　voice　as　he　did　so。　

〃It　is　not　only　for　pleasure　that　I　am　here；　M。　Van　Aldin。　Observe　just　opposite　us　that　ill　old　man　…　the　one　with　the　yellow　face　and　the　venerable　beard。〃　

〃Well；　what　of　him？〃　

〃That；〃　Poirot　said；　〃is　M。　Papopolous。〃　

〃A　Greek；　eh？〃　

〃As　you　say　…　a　Greek。　He　is　a　dealer　in　antiques　of　world…wide　reputation。　He　has　a　small　shop　in　Paris；　and　he　is　suspected　by　the　police　of　being　something　more。〃　

〃What？〃　

〃A　receiver　of　stolen　goods；　especially　jewels。　There　is　nothing　as　to　the　re…cutting　and　re…setting　of　gems　that　he　does　not　know。　He　deals　with　the　highest　in　Europe　and　with　the　lowest　of　the　riff…raff　of　the　underworld。〃　

Van　Aldin　was　looking　at　Poirot　with　suddenly　awakened　attention。　

〃Well？〃　he　demanded；　a　new　note　in　his　voice。　

〃I　ask　myself；〃　said　Poirot；　〃I；　Hercule　Poirot　…〃　he　thumped　himself　dramatically　on　the　chest　…　〃ask　myself　why　is　M。　Papopolous　suddenly　e　to　Nice？〃　

Van　Aldin　was　impressed。　For　a　moment　he　had　doubted　Poirot　and　suspected　the　little　man　of　being　past　his　job；　a　poseur　only　…　now；　in　a　moment；　he　switched　back　to　his　original　opinion。　He　looked　straight　at　the　little　detective。　

〃I　must　apologize　to　you；　M。　Poirot。〃　

Poirot　waved　the　apology　aside　with　an　extravagant　gesture。　

〃Bah！〃　he　cried；　〃all　that　is　of　no　importance。　Now　listen；　M。　Van　Aldin；　I　have　news　for　you。〃　

The　millionaire　looked　sharply　at　him；　all　his　interest　aroused。　

Poirot　nodded。　

〃It　is　as　I　say。　You　will　be　interested。　As　you　know；　M。　Van　Aldin；　the　te　de　la　Roche　has　been　under　surveillance　ever　since　his　interview　with　the　Juge　d'Instruction。　The　day　after　that；　during　his　absence；　the　Villa　Marina　was　searched　by　the　police。〃　

〃Well；〃　said　Van　Aldin；　〃did　they　find　anything？　I　bet　they　didn't。〃　

Poirot　made　him　a　little　bow。　

〃Your　acumen　is　not　at　fault；　M。　Van　Aldin。　They　found　nothing　of　an　incriminating　nature。　It　was　not　to　be　expected　that　they　would。　The　te　de　la　Roche；　as　your　expressive　idiom　has　it；　was　not　born　on　the　preceding　day。　He　is　an　astute　gentleman　with　great　experience。〃　

〃Well；　go　on；〃　growled　Van　Aldin。　

〃It　may　be；　of　course；　that　the　te　had　nothing　of　a　promising　nature　to　conceal。　But　we　must　not　neglect　the　possibility。　If　then；　he　has　something　to　conceal；　where　is　it？　Not　in　his　house　…　the　police　searched　thoroughly。　Not　on　his　person；　for　he　knows　that　he　is　liable　to　arrest　at　any　minute。　There　remains　…　his　car。　As　I　say；　he　was　under　surveillance。　He　was　followed　on　that　day　to　Monte　Carlo。　From　there　he　went　by　road　to　Mentone；　driving　himself。　His　car　is　a　very　powerful　one；　it　outdistanced　his　pursuers　and　for　about　a　quarter　of　an　hour　they　pletely　lost　sight　of　him。〃　

〃And　during　that　time　you　think　he　concealed　something　by　the　roadside？〃　asked　Van　Aldin；　keenly　interested。　

〃By　the　roadside；　no。　？a　n'est　pas　pratique。　But　listen　now　…　me；　I　have　made　a　little　suggestion　to　M。　Carrege。　He　is　graciously　pleased　to　approve　of　it。　In　each　Bureau　de　Poste　in　the　neighbourhood　it　has　been　seen　to　that　there　is　someone　who　knows　the　te　de　la　Roche　by　sight。　Because；　you　see；　Messieurs；　the　best　way　of　hiding　a　thing　is　by　sending　it　away　by　the　post。〃　

〃Well？〃　demanded　Van　Aldin；　his　face　was　keenly　alight　with　interest　and　expectation。　

〃Well　…〃　With　a　dramatic　flourish　Poirot　drew　out　from　his　pocket　a　loosely　wrapped　brown　paper　package　from　which　the　string　had　been　removed。　

〃During　that　quarter　of　an　hour's　interval；　our　good　gentleman　mailed　this。〃　

〃The　address？〃　asked　the　other　sharply。　

Poirot　nodded　his　head。　

〃Might　have　told　us　something；　but　unfortunately　it　does　not。　The　package　was　addressed　to　one　of　these　little　newspaper　shops　in　Paris　where　letters　and　parcels　are　kept　until　called　for　on　payment　of　a　small　mission。〃　

〃Yes；　but　what　is　inside？〃　demanded　Van　Aldin　impatiently。　

Poirot　unwrapped　the　brown　paper　and　disclosed　a　square　cardboard　box。　He　looked　round　him。　

〃It　is　a　good　moment；〃　he　said　quietly。　〃All　eyes　are　on　the　tennis。　Look；　Monsieur！〃　

He　lifted　the　lid　of　the　box　for　the　fraction　of　a　second。　An　exclamation　of　utter　astonishment　came　from　the　millionaire。　His　face　turned　as　white　as　chalk。　

〃My　God！〃　he　breathed；　〃the　rubies。〃　

He　sat　for　a　minute　as　though　dazed。　Poirot　restored　the　box　to　his　pocket。　Then　suddenly　the　millionaire　seemed　to　e　out　of　his　trance；　he　leaned　across　to　Poirot　and　wrung　his　hand　so　heartily　that　the　little　man　winced　with　pain。　

〃This　is　great；〃　said　Van　Aldin。　〃Great！　You　are　the　goods；　M。　Poirot。　Once　and　for　all；　you　are　the　goods。〃　

〃It　is　nothing；〃　said　Poirot　modestly。　〃Order；　method；　being　prepared　for　eventualities　beforehand　…　that　is　all　there　is　to　it。〃　

〃And　now；　I　suppose；　the　te　de　la　Roche　has　been　arrested？〃　continued　Van　Aldin　eagerly。　

〃No；〃　said　Poirot。　

A　look　of　utter　astonishment　came　over　Van　Aldin's　face。　

〃But　why？　What　more　do　you　want？〃　

〃The　te's　alibi　is　still　unshaken。〃　

〃But　that　is　nonsense。〃　

〃Yes；〃　said　Poirot；　〃I　rather　think　it　is　nonsense；　but　unfortunately　we　have　to　prove　it　so。〃　

〃In　the　meantime　he　will　slip　through　your　fingers。〃　

Poirot　shook　his　head　very　energetically。　

〃No；〃　he　said；　〃he　will　not　do　that。　The　one　thing　the　te　cannot　afford　to　sacrifice　is　his　social　position。　At　all　costs　he　must　stop　and　brazen　it　out。〃　

Van　Aldin　was　still　dissatisfied。　

〃But　I　don't　see　…〃　

Poirot　raised　a　hand。　〃Grant　me　a　little　moment；　Monsieur。　Me；　I　have　a　little　idea。　Many　have　mocked　themselves　at　the　little　ideas　of　Hercule　Poirot　…　and　they　have　been　wrong。〃　

〃Well；〃　said　Van　Aldin；　〃go　ahead。　What　is　this　little　idea？〃　

Poirot　paused　for　a　moment　and　then　he　said：　

〃I　will　call　upon　you　at　your　hotel　at　eleven　o'clock　tomorrow　morning。　Until　then；　say　nothing　to　anyone。〃

Chapter　22　

M。　PAPOPOULOS　AT　BREAKFAST

M。　Papopolous　was　at　breakfast。　Opposite　him　sat　his　daughter；　Zia。　

There　was　a　knock　at　the　sitting…room　door；　and　a　chasseur　entered　with　a　card　which　he　brought　to　Mr　Papopolous。　The　latter　scrutinized　it；　raised　his　eyebrows；　and　passed　it　over　to　his　daughter。　

〃Ah！〃　said　M。　Papopolous；　scratching　his　left　ear　thoughtfully；　〃Hercule　Poirot。　I　wonder　now。〃　

Father　and　daughter　looked　at　each　other。　

〃I　saw　him　yesterday　at　the　tennis；〃　said　M。　Papopolous。　〃Zia；　I　hardly　like　this。〃　

〃He　was　very　useful　to　you　once；〃　his　daughter　reminded　him。　

〃That　is　true；〃　acknowledged　M。　Papopolous；　〃also　he　has　retired　from　active　work；　so　I　hear。〃　

These　interchanges　between　father　and　daughter　had　passed　in　their　own　language。　Now　M。　Papopolous　turned　to　the　chasseur　and　said　in　French：　

〃Faites　monter　ce　monsieur。〃　

A　few　minutes　later　Hercule　Poirot；　exquisitely　attired；　and　swinging　a　cane　with　a　jaunty　air；　entered　the　room。　

〃My　dear　M。　Papopolous。〃　

〃My　dear　M。　Poirot。〃　

〃And　Mademoiselle　Zia。〃　Poirot　swept　her　a　low　bow。　

〃You　will　excuse　us　going　on　with　our　breakfast；〃　said　M。　Papopolous；　pouring　himself　out　another　cup　of　coffee。　〃Your　call　is　…　ahem！　…　a　little　early。〃　

〃It　is　scandalous；〃　said　Poirot；　〃but　see　you；　I　am　pressed。〃　

〃Ah！〃　murmured　M。　Papopolous；　〃you　are　on　an　affair　then？〃　

〃A　very　serious　affair；〃　said　Poirot；　〃the　death　of　Madame　Kettering。〃　

〃Let　me　see；〃　M。　Papopolous　looked　innocently　up　at　the　ceiling；　〃that　was　the　lady　who　died　on　the　Blue　Train；　was　it　not？　I　saw　a　mention　of　it　in　the　papers；　but　there's　no　suggestion　of　foul　play。〃　

〃In　the　interests　of　justice；〃　said　Poirot；　〃it　was　thought　best　to　suppress　that　fact。〃　

There　was　a　pause。　

〃And　in　what　way　can　I　assist　you；　Mr　Poirot？〃　asked　the　dealer　politely。　

〃Voilà；〃　said　Poirot；　〃I　shall　e　to　the　point。〃　He　took　from　his　pocket　the　same　box　that　he　had　displayed　at　Cannes；　and　opening　it；　he　took　out　the　rubies　and　pushed　them　across　the　table　to　Papopolous。　

Although　Poirot　was　watching　him　narrowly；　not　a　muscle　of　the　old　man's　face　moved。　He　took　up　the　jewels　and　examined　them　with　a　kind　of　detached　interest；　then　he　looked　across　at　the　detective　inquiringly：　

〃Superb；　are　they　not？〃　asked　Poirot。　

〃Quite　excellent；〃　said　M。　Papopolous。　

〃How　much　should　you　say　they　are　worth？〃　

The　Greek's　face　quivered　a　little。　

〃Is　it　really　necessary　to　tell　you；　M。　Poirot？〃　he　asked。　

〃You　are　shrewd；　M。　Papopolous。　No；　it　is　not。　They　are　not；　for　instance；　worth　five　hundred　thousand　dollars。〃　

Papopolous　laughed；　and　Poirot　joined　with　him。　

〃As　an　imitation；〃　said　Papopolous；　handing　them　back　to　Poirot；　〃they　are；　as　I　said；　quite　excellent。　Would　it　be　indiscreet　to　ask；　M。　Poirot；　where　you　came　across　them？〃　

〃Not　at　all；〃　said　Poirot；　〃I　have　no　objection　to　telling　an　old　friend　like　yourself。　They　were　in　the　possession　of　the　te　de　la　Roche。〃　

M。　Papopolous'　eyebrows　lifted　themselves　eloquently。　

〃In…deed；〃　he　murmured。　

Poirot　leant　forward　and　assumed　his　most　innocent　and　beguiling　air。　

〃M。　Papopolous；〃　he　said；　〃I　am　going　to　lay　my　cards　upon　the　table。　The　original　of　these　jewels　was　stolen　from　Madame　Kettering　on　the　Blue　Train。　Now　I　will　say　to　you　first　this：　I　am　not　concerned　with　the　recovery　of　these　jewels。　That　is　the　affair　of　the　police。　I　am　working　not　for　the　police　but　for　M。　Van　Aldin。　I　want　to　lay　hands　on　the　man　who　killed　Madame　Kettering。　I　am　interested　in　the　jewels　only　in　so　far　as　they　may　lead　me　to　the　man。　You　understand？〃　

The　last　two　words　were　uttered　with　great　magnificence。　M。　Papopolous；　his　face　quite　unmoved；　said　quietly：　〃Go　on。〃　

〃It　seems　to　me　probable；　Monsieur；　that　the　jewels　will　change　hands　in　Nice　…　maybe　they　h