The Dangerfield Talisman by J.J. Connington

Conway Westenhanger had no very high opinion of his own ability to unravel the Talisman mystery, and the more he thought over the subject the less could he see any simple solution. One point, however, seemed beyond dispute: the method of elimination, as handled by Freddie Stickney, had been given a trial and had led to absolutely nothing whatever. The net result of Freddie's efforts was that everybody had been made to feel uncomfortable, while not a single gleam of light had been thrown upon the problem. And yet, given the conditions of the case, the elimination method seemed to promise results. If the servants were put on one side, and if no thief had got into the house in the darkness, then only thirteen persons remained who had any possible means of access to the Corinthian's Room that night. One of them must be responsible for the vanishing of the Talisman. That seemed an inevitable conclusion.

But here his train of thought was crossed by another. He could not quite dismiss from his mind the impression made upon him by the way in which old Rollo Dangerfield had taken his loss.