eight o'clock on Christmas Eve
`` You forget Signor Ferruci also proved an alibi . '' `` A very doubtful one , '' said Miss Vrain scornfully . `` You did not ask that Dr. Jorce the questions you should have done . Go up to London now , Lucian , see him at Hampstead , and find out if Ferruci was at his house at eight o'clock on Christmas Eve . Then I shall believe him guiltless ; till then , I hold him but the creature and tool of Lydia . '' `` Jorce declares that Ferruci was with him at the house when the murder was committed ? '' `` Can you believe that ?