S
WAnd Four to Go
WBlack OrchidsA
WCurtains for Three
WDeath Times ThreeB
WHomicide Trinity
WNot Quite Dead EnoughC
WThree at Wolfe's Door
WThree Doors to DeathD
WThree for the Chair
WThree Men OutE
WThree Witnesses (book)
WTrio for Blunt InstrumentsF
WTriple Jeopardy
WTrouble in Triplicate