had　a　case　which　was　more　difficult　to　get　at。　Every　fresh　advance
  which　we　make　only　reveals　a　fresh　ridge　beyond。　And　yet　we　have
  surely　made　some　appreciable　progress。
  〃The　effect　of　our　inquiries　at　Woolwich　has　in　the　main　been
  against　young　Cadogan　West；　but　the　indications　at　the　window　would
  lend　themselves　to　a　more　favourable　hypothesis。　Let　us　suppose；　for
  example；　that　he　had　been　approached　by　some　foreign　agent。　It　might
  have　been　done　under　such　pledges　as　would　have　prevented　him　from
  speaking　of　it；　and　yet　would　have　affected　his　thoughts　in　the
  direction　indicated　by　his　remarks　to　his　fiancee。　Very　good。　We
  will　now　suppose　that　as　he　went　to　the　theatre　with　the　young　lady　he
  suddenly；　in　the　fog；　caught　a　glimpse　of　this　same　agent　going　in　the
  direction　of　the　office。　He　was　an　impetuous　man；　quick　in　his
  decisions。　Everything　gave　way　to　his　duty。　He　followed　the　man；
  reached　the　window；　saw　the　abstraction　of　the　documents；　and
  pursued　the　thief。　In　this　way　we　get　over　the　objection　that　no　one
  would　take　originals　when　he　could　make　copies。　This　outsider　had　to
  take　originals。　So　far　it　holds　together。〃
  〃What　is　the　next　step？〃
  〃Then　we　come　into　difficulties。　One　would　imagine　that　under　such
  circumstances　the　first　act　of　young　Cadogan　West　would　be　to　seize
  the　villain　and　raise　the　alarm。　Why　did　he　not　do　so？　Could　it　have
  been　an　official　superior　who　took　the　papers？　That　would　explain
  West's　conduct。　Or　could　the　chief　have　given　West　the　slip　in　the
  fog；　and　West　started　at　once　to　London　to　head　him　off　from　his　own
  rooms；　presuming　that　he　knew　where　the　rooms　were？　The　call　must　have
  been　very　pressing；　since　he　left　his　girl　standing　in　the　fog　and
  made　no　effort　to　communicate　with　her。　Our　scent　runs　cold　here；
  and　there　is　a　vast　gap　between　either　hypothesis　and　the　laying　of
  West's　body；　with　seven　papers　in　his　pocket；　on　the　roof　of　a
  Metropolitan　train。　My　instinct　now　is　to　work　from　the　other　end。
  If　Mycroft　has　given　us　the　list　of　addresses　we　may　be　able　to　pick
  our　man　and　follow　two　tracks　instead　of　one。〃
  Surely　enough；　a　note　awaited　us　at　Baker　Street。　A　government
  messenger　had　brought　it　post…haste。　Holmes　glanced　at　it　and　threw　it
  over　to　me。
  〃There　are　numerous　small　fry；　but　few　who　would　handle　so　big　an
  affair。　The　only　men　worth　considering　are　Adolph　Meyer；　of　13　Great
  George　Street；　Westminster；　Louis　La　Rothiere；　of　Campden　Mansions；
  Notting　Hill；　and　Hugo　Oberstein；　13　Caulfield　Gardens；　Kensington。
  The　latter　was　known　to　be　in　town　on　Monday　and　is　now　reported　as
  having　left。　Glad　to　hear　you　have　seen　some　light。　The　Cabinet　awaits
  your　final　report　with　the　utmost　anxiety。　Urgent　representations　have
  arrived　from　the　very　highest　quarter。　The　whole　force　of　the　State　is
  at　your　back　if　you　should　need　it。
  MYCROFT。
  〃I'm　afraid；〃　said　Holmes；　smiling；　〃that　all　the　queen's　horses　and
  all　the　queen's　men　cannot　avail　in　this　matter。〃　He　had　spread　out
  his　big　map　of　London　and　leaned　eagerly　over　it。　〃Well；　well；〃　said
  he　presently　with　an　exclamation　of　satisfaction；　〃things　are
  turning　a　little　in　our　direction　at　last。　Why；　Watson；　I　do
  honestly　believe　that　we　are　going　to　pull　it　off；　after　all。〃　He
  slapped　me　on　the　shoulder　with　a　sudden　burst　of　hilarity；　〃I　am
  going　out　now。　It　is　only　a　reconnaissance。　I　will　do　nothing
  serious　without　my　trusted　comrade　and　biographer　at　my　elbow。　Do
  you　stay　here；　and　the　odds　are　that　you　will　see　me　again　in　an
  hour　or　two。　If　time　hangs　heavy　get　foolscap　and　a　pen；　and　begin
  your　narrative　of　how　we　saved　the　State。〃
  I　felt　some　reflection　of　his　elation　in　my　own　mind；　for　I　knew
  well　that　he　would　not　depart　so　far　from　his　usual　austerity　of
  demeanour　unless　there　was　good　cause　for　exultation。　All　the　long
  November　evening　I　waited；　filled　with　impatience　for　his　return。　At
  last；　shortly　after　nine　o'clock；　there　arrived　a　messenger　with　a
  note：
  Am　dining　at　Goldini's　Restaurant；　Gloucester　Road；　Kensington。
  Please　come　at　once　and　join　me　there。　Bring　with　you　a　jemmy；　a
  dark　lantern；　a　chisel；　and　a　revolver。
  S。　H。
  It　was　a　nice　equipment　for　a　respectable　citizen　to　carry　through
  the　dim；　fog…draped　streets。　I　stowed　them　all　discreetly　away　in　my
  overcoat　and　drove　straight　to　the　address　given。　There　sat　my
  friend　at　a　little　round　table　near　the　door　of　the　garish　Italian
  restaurant。
  〃Have　you　had　something　to　eat？　Then　join　me　in　a　coffee　and
  curacao。　Try　one　of　the　proprietor's　cigars。　They　are　less　poisonous
  than　one　would　expect。　Have　you　the　tools？〃
  〃They　are　here；　in　my　overcoat。〃
  〃Excellent。　Let　me　give　you　a　short　sketch　of　what　I　have　done；　with
  some　indication　of　what　we　are　about　to　do。　Now　it　must　be　evident
  to　you；　Watson；　that　this　young　man's　body　was　placed　on　the　roof　of
  the　train。　That　was　clear　from　the　instant　that　I　determined　the
  fact　that　it　was　from　the　roof；　and　not　from　a　carriage；　that　he　had
  fallen。〃
  〃Could　it　not　have　been　dropped　from　a　bridge？〃
  〃I　should　say　it　was　impossible。　If　you　examine　the　roofs　you　will
  find　that　they　are　slightly　rounded；　and　there　is　no　railing　round
  them。　Therefore；　we　can　say　for　certain　that　young　Cadogan　West　was
  placed　on　it。〃
  〃How　could　he　be　placed　there？〃
  〃That　was　the　question　which　we　had　to　answer。　There　is　only　one
  possible　way。　You　are　aware　that　the　Underground　runs　clear　of　tunnels
  at　some　points　in　the　West　End。　I　had　a　vague　memory　that　as　I　have
  travelled　by　it　I　have　occasionally　seen　windows　just　above　my　head。
  Now；　suppose　that　a　train　halted　under　such　a　window；　would　there　be
  any　difficulty　in　laying　a　body　upon　the　roof？〃
  〃It　seems　most　improbable。〃
  〃We　must　fall　back　upon　the　old　axiom　that　when　all　other
  contingencies　fail；　whatever　remains；　however　improbable；　must　be
  the　truth。　Here　all　other　contingencies　have　failed。　When　I　found　that
  the　leading　international　agent；　who　had　just　left　London；　lived　in
  a　row　of　houses　which　abutted　upon　the　Underground；　I　was　so　pleased
  that　you　were　a　little　astonished　at　my　sudden　frivolity。〃
  〃Oh；　that　was　it；　was　it？〃
  〃Yes；　that　was　it。　Mr。　Hugo　Oberstein；　Of　13　Caulfield　Gardens；
  had　become　my　objective。　I　began　my　operations　at　Gloucester　Road
  Station；　where　a　very　helpful　official　walked　with　me　along　the
  track　and　allowed　me　to　satisfy　myself　not　only　that　the　back…stair
  windows　of　Caulfield　Gardens　open　on　the　line　but　the　even　more
  essential　fact　that；　owing　to　the　intersection　of　one　of　the　larger
  railways；　the　Underground　trains　are　frequently　held　motionless　for
  some　minutes　at　that　very　spot。〃
  〃Splendid；　Holmes！　You　have　got　it！〃
  〃So　far…　so　far；　Watson。　We　advance；　but　the　goal　is　afar。　Well；
  having　seen　the　back　of　Caulfield　Gardens；　I　visited　the　front　and
  satisfied　myself　that　the　bird　was　indeed　flown。　It　is　a
  considerable　house；　unfurnished；　so　far　as　I　could　judge；　in　the　upper
  rooms。　Oberstein　lived　there　with　a　single　valet；　who　was　probably　a
  confederate　entirely　in　his　confidence。　We　must　bear　in　mind　that
  Oberstein　has　gone　to　the　Continent　to　dispose　of　his　booty；　but　not
  with　any　idea　of　flight；　for　he　had　no　reason　to　fear　a　warrant；　and
  the　idea　of　an　amateur　domiciliary　visit　would　certainly　never　occur
  to　him。　Yet　that　is　precisely　what　we　are　about　to　make。〃
  〃Could　we　not　get　a　warrant　and　legalize　it？〃
  〃Hardly　on　the　evidence。〃
  〃What　can　we　hope　to　do？〃
  〃We　cannot　tell　what　correspondence　may　be　there。〃
  〃I　don't　like　it；　Holmes。〃
  〃My　dear　fellow；　you　shall　keep　watch　in　the　street。　I'll　do　the
  criminal　part。　It's　not　a　time　to　stick　at　trifles。　Think　of　Mycroft's
  note；　of　the　Admiralty；　the　Cabinet；　the　exalted　person　who　waits
  for　news。　We　are　bound　to　go。〃
  My　answer　was　to　rise　from　the　table。
  〃You　are　right；　Holmes。　We　are　bound　to　go。〃
  He　sprang　up　and　shook　me　by　the　hand。
  〃I　knew　you　would　not　shrink　at　the　last；〃　said　he；　and　for　a　moment
  I　saw　something　in　his　eyes　which　was　nearer　to　tenderness　than　I
  had　ever　seen。　The　next　instant　he　was　his　masterful；　practical　self
  once　more。
  〃It　is　nearly　half　a　mile；　but　there　is　no　hurry。　Let　us　walk；〃　said
  he。　〃Don't　drop　the　instruments；　I　beg。　Your　arrest　as　a　suspicious
  character　would　be　a　most　unfortunate　complication。〃
  Caulfield　Gardens　was　on　of　those　lines　of　flat…faced　pillared；
  and　porticoed　houses　which　are　so　prominent　a　product　of　the　middle
  Victorian　epoch　in　the　West　End　of　London。　Next　door　there　appeared　to
  be　a　children's　party；　for　the　merry　buzz　of　young　voices　and　the
  clatter　of　a　piano　resounded　through　the　night。　The　fog　still　hung
  about　and　screened　us　with　its　friendly　shade。　Holmes　had　lit　his
  lantern　and　flashed　it　upon　the　massive　door。
  〃This　is　a　serious　proposition；〃　said　he。　〃It　is　certainly　bolted　as
  well　as　locked。　We　would　do　better　in　the　area。　There　is　an
  excellent　archway　down　yonder　in　case　a　too　ze