ten o'clock
She unfastened Lupin 's right hand , gave him a pen and said : `` Do n't forget that the four cheques require four different signatures and that the handwriting has to be altered in each case . '' `` Never fear . '' He signed the cheques . `` Gabriel , '' said the widow , `` it is ten o'clock . If I am not back by twelve , it will mean that this scoundrel has played me one of his tricks . At twelve o'clock , blow out his brains . I am leaving you the revolver with which your uncle shot himself .