s　…　when　a　millionaire　pays。〃

〃The　Russian　Embassy；〃　said　Katherine；　frowning。　〃No；　I　don't　see　where　that　es　in。〃

〃It　does　not　e　in　directly；　Mademoiselle。　I　went　there　to　get　certain　information。　I　saw　a　particular　personage　and　I　threatened　him　…　yes；　Mademoiselle；　I；　Hercule　Poirot；　threatened　him。〃

〃With　the　police？〃

〃No；〃　said　Poirot　drily；　〃with　the　Press　…　a　much　more　deadly　weapon。〃

He　looked　at　Katherine　and　she　smiled　at　him；　just　shaking　her　head。

〃Are　you　not　just　turning　back　into　an　oyster　again；　Monsieur　Poirot？〃

〃No；　no！　I　do　not　wish　to　make　mysteries。　See；　I　will　tell　you　everything。　I　suspect　this　man　of　being　the　active　party　in　the　sale　of　the　jewels　of　Monsieur　Van　Aldin。　I　tax　him　with　it；　and　in　the　end　I　get　the　whole　story　out　of　him。　I　learn　where　the　jewels　were　handed　over；　and　I　learn；　too；　of　the　man　who　paced　up　and　down　outside　in　the　street　…　a　man　with　a　venerable　head　of　white　hair；　but　who　walked　with　the　light；　springy　step　of　a　young　man　…　and　I　give　that　man　a　name　in　my　own　mind　…　the　name　of　'Monsieur　le　Marquis。'〃

〃And　now　you　have　e　to　London　to　see　Mr　Van　Aldin？〃

〃Not　entirely　for　that　reason。　I　had　other　work　to　do。　Since　I　have　been　in　London　I　have　seen　two　more　people　…　a　theatrical　agent　and　a　Harley　Street　doctor。　From　each　of　them　I　have　got　certain　information。　Put　these　things　together；　Mademoiselle；　and　see　if　you　can　make　of　them　the　same　as　I　do。〃

〃I？〃

〃Yes；　you。　I　will　tell　you　one　thing；　Mademoiselle。　There　has　been　a　doubt　all　along　in　my　mind　as　to　whether　the　robbery　and　the　murder　were　done　by　the　same　person。　For　a　long　time　I　was　not　sure　…〃

〃And　now？〃

〃And　now　I　know。〃

There　was　a　silence。　Then　Katherine　lif