▁is ▁the ▁crypt . ▁John ▁Mason ▁obser ves ▁that ▁a ▁heap ▁of ▁b ones ▁there ▁earlier ▁is ▁now ▁gone . ▁Hol mes ▁finds ▁a ▁coff in ▁with ▁a ▁fresh , ▁sw athed ▁body ▁in ▁it . ▁Just ▁then , ▁Sir ▁Robert ▁arriv es , ▁catch ing ▁Hol mes ▁and ▁Watson ▁in ▁the ▁act . ▁After ▁Hol mes ▁makes ▁it ▁plain ▁that ▁he ▁has ▁dedu ced ▁most ▁of ▁the ▁odd ▁go ings - on , ▁Sir ▁Robert ▁inv ites ▁him ▁and ▁Watson ▁back ▁to ▁the ▁house ▁and ▁explains ▁everything . ▁ ▁About ▁a ▁week ▁earlier , ▁Lady ▁Be atrice ▁died ▁of ▁dro ps y , ▁and ▁Sir ▁Robert ▁felt ▁comp elled ▁to ▁keep ▁the ▁fact ▁secret ▁so ▁that ▁the ▁credit ors ▁would ▁not ▁swo op ▁down ▁on ▁Sh os com be ▁before ▁he ▁had ▁a ▁chance ▁to ▁win ▁the ▁Derby ▁and ▁pay ▁off ▁all ▁his ▁deb ts . ▁He ▁and ▁the ▁ma id ' s ▁husband ▁hid ▁the ▁body ▁in ▁the ▁crypt , ▁but ▁also ▁found ▁that ▁they ▁had ▁to ▁dispose ▁of ▁an ▁older ▁body — in ▁the ▁furn ace . ▁This ▁same ▁man ▁also ▁dressed ▁up ▁in ▁Lady ▁Be atrice ' s ▁clothes ▁and ▁took ▁her ▁place ▁in ▁the ▁carriage ▁each ▁day . ▁The ▁dog ▁knew ▁what ▁had ▁happened ▁and ▁might ▁have ▁given ▁the ▁game ▁away ▁if ▁its ▁noise ▁had ▁ar oused ▁susp icion . ▁ ▁Hol mes ▁refers ▁the ▁matter ▁to ▁the ▁police , ▁but ▁the ▁story ▁ends ▁happ ily . ▁Sh os com be ▁Prince ▁wins ▁the ▁Derby , ▁Sir ▁Robert