gallery〃　occurred。
  The　third　time　she　had　determined　to　keep　the　appointment。　　He
  asked　for　it　in　the　letter　he　had　written　in　her　own　room；　on　the
  night　of　the　incident　in　the　gallery；　which　he　left　on　her　desk。
  In　that　letter　he　threatened　to　burn　her　father's　papers　if　she
  did　not　meet　him。　　It　was　to　rescue　these　papers　that　she　made　up
  her　mind　to　see　him。　　She　did　not　for　one　moment　doubt　that　the
  wretch　would　carry　out　his　threat　if　she　persisted　in　avoiding　him；
  and　in　that　case　the　labours　of　her　father's　lifetime　would　be　for
  ever　lost。　　Since　the　meeting　was　thus　inevitable；　she　resolved　to
  see　her　husband　and　appeal　to　his　better　nature。　　It　was　for　this
  interview　that　she　had　prepared　herself　on　the　night　the　keeper　was
  killed。　　They　did　meet；　and　what　passed　between　them　may　be　imagined。
  He　insisted　that　she　renounce　Darzac。　　She；　on　her　part；　affirmed
  her　love　for　him。　　He　stabbed　her　in　his　anger；　determined　to　convict
  Darzac　of　the　crime。　　As　Larsan　he　could　do　it；　and　had　so　managed
  things　that　Darzac　could　never　explain　how　he　had　employed　the　time
  of　his　absence　from　the　chateau。　　Ballmeyer's　precautions　were　most
  cunningly　taken。
  Larsan　had　threatened　Darzac　as　he　had　threatened　Mathilde　…　with
  the　same　weapon；　and　the　same　threats。　　He　wrote　Darzac　urgent
  letters；　declaring　himself　ready　to　deliver　up　the　letters　that　had
  passed　between　him　and　his　wife；　and　to　leave　them　for　ever；　if　he
  would　pay　him　his　price。　　He　asked　Darzac　to　meet　him　for　the
  purpose　of　arranging　the　matter；　appointing　the　time　when　Larsan
  would　be　with　Mademoiselle　Stangerson。　　When　Darzac　went　to　Epinay；
  expecting　to　find　Ballmeyer　or　Larsan　there；　he　was　met　by　an
  accomplice　of　Larsan's；　and　kept　waiting　until　such　time　as　the
  〃coincidence〃　could　be　established。
  It　was　all　done　with　Machiavellian　cunning；　but　Ballmeyer　had
  reckoned　without　Joseph　Rouletabille。
  Now　that　the　Mystery　of　The　Yellow　Room　has　been　cleared　up；　this
  is　not　the　time　to　tell　of　Rouletabile's　adventures　in　America。
  Knowing　the　young　reporter　as　we　do；　we　can　understand　with　what
  acumen　he　had　traced；　step　by　step；　the　story　of　Mathilde　Stangerson
  and　Jean　Roussel。　　At　Philadelphia　he　had　quickly　informed　himself
  as　to　Arthur　William　Rance。　　There　he　learned　of　Rance's　act　of
  devotion　and　the　reward　he　thought　himself　entitled　to　for　it。　　A
  rumour　of　his　marriage　with　Mademoiselle　Stangerson　had　once　found
  its　way　into　the　drawing…rooms　of　Philadelphia。　　He　also　learned　of
  Rance's　continued　attentions　to　her　and　his　importunities　for　her
  hand。　　He　had　taken　to　drink；　he　had　said；　to　drown　his　grief　at
  his　unrequited　love。　　It　can　now　be　understood　why　Rouletabille
  had　shown　so　marked　a　coolness　of　demeanour　towards　Rance　when　they
  met　in　the　witnesses'　room；　on　the　day　of　the　trial。
  The　strange　Roussel…Stangerson　mystery　had　now　been　laid　bare。　　Who
  was　this　Jean　Roussel？　　Rouletabille　had　traced　him　from　Philadelphia
  to　Cincinnati。　　In　Cincinnati　he　became　acquainted　with　the　old　aunt；
  and　had　found　means　to　open　her　mouth。　　The　story　of　Ballmeyer's
  arrest　threw　the　right　light　on　the　whole　story。　　He　visited　the
  〃presbytery〃…　a　small　and　pretty　dwelling　in　the　old　colonial　style
  …　which　had；　indeed；　〃lost　nothing　of　its　charm。〃　　Then；　abandoning
  his　pursuit　of　traces　of　Mademoiselle　Stangerson；　he　took　up　those
  of　Ballmeyer。　　He　followed　them　from　prison　to　prison；　from　crime
  to　crime。　　Finally；　as　he　was　about　leaving　for　Europe；　he　learned
  in　New　York　that　Ballmeyer　had；　five　years　before；　embarked　for
  France　with　some　valuable　papers　belonging　to　a　merchant　of　New
  Orleans　whom　he　had　murdered。
  And　yet　the　whole　of　this　mystery　has　not　been　revealed。
  Mademoiselle　Stangerson　had　a　child；　by　her　husband；　…　a　son。　　The
  infant　was　born　in　the　old　aunt's　house。　　No　one　knew　of　it；　so
  well　had　the　aunt　managed　to　conceal　the　event。
  What　became　of　that　son？　…　That　is　another　story　which；　so　far；　I
  am　not　permitted　to　relate。
  About　two　months　after　these　events；　I　came　upon　Rouletabille　sitting
  on　a　bench　in　the　Palais　de　Justice；　looking　very　depressed。
  〃What's　the　matter；　old　man？〃　I　asked。　　〃You　are　looking　very　down。
  cast。　　How　are　your　friends　getting　on？〃
  〃Apart　from　you；〃　he　said；　〃I　have　no　friends。〃
  〃I　hope　that　Monsieur　Darzac　…〃
  〃No　doubt。〃
  〃And　Mademoiselle　Stangerson　…　How　is　she？〃
  〃Better　…　much　better。〃
  〃Then　you　ought　not　to　be　sad。〃
  〃I　am　sad；〃　he　said；　〃because　I　am　thinking　of　the　perfume　of　the
  lady　in　black　…〃
  〃The　perfume　of　the　lady　in　black！　　…　I　have　heard　you　often　refer
  to　it。　　Tell　me　why　it　troubles　you。〃
  〃Perhaps　…　some　day；　some　day；〃　said　Rouletabille。
  And　he　heaved　a　profound　sigh。
  End