half
past eleven
fat-headed -- belief that Miss Martin would marry you for the mere asking , led you into deep waters . It was a mistake , too , when you lied to P.C. Robinson as to the time you came home on that Monday night . You told him you walked straight here from the Hare and Hounds at ten o ` clock . You know you did n't -- that it was nearer half past eleven when you reached this house . Consider what that discrepancy alone might have meant if Scotland Yard failed to take your measure correctly . Then add the fact that the murderer wore the hat , wig , and whiskers in which you made a guy of yourself while filling the rôle of Svengali last winter . Now , I ask you , Elkin , where would you have stood with the average British jury when the prosecution established those three things : Motive , your jealousy of Grant ; time , your unaccounted-for disappearance during the hour when the crime was committed ; and disguise , a clumsy suggestion of Owd Ben 's ghost ?