For the next hour or so--he did not pay much attention to the time--Vernon wondered how The Spider came to know of Dimsdale's trap, and how he had so cleverly laid his own. The blackmailer seemed to know everybody's business, as his profession required, so in some way he had managed to learn of Vernon's love for Miss Corsoon. Only such a message from such a girl would have lured the lover into such a predicament, and The Spider had not only been clever enough to know this, but had been clever enough to utilize his knowledge. For the moment--it was a wild thought, and passed in a flash--Vernon wondered if Constantine Maunders had anything to do with the matter. But the idea was ridiculous, since The Spider was attempting to blackmail Mrs. Bedge, which Maunders certainly would not countenance. But if not Maunders, who could it be? Certainly Dimsdale might have talked to someone else about the proposed trap, since he was extremely frank and injudicious in his speech. Vernon resolved to question him on this point when next they met, and hoped from his reply to learn who had lured him to No. 34, Waller Street, West Kensington. Having arrived at this conclusion, he rested his head on the overcoat and tried to sleep, since it was foolish to waste his strength in beating his wings against the prison bars. After a time, so tired was his brain with hard thinking, that he actually fell asleep. How long the sleep lasted he did not know, but he woke from a troubled dream with the idea that he heard soft retreating footsteps. The candle was burnt to the socket and the room was extremely dark, so Vernon sat up in a confused way, trying to recall his position. With alert ears he hearkened for the presumed footsteps, but as there was no sound save his own laboured breathing, he decided that he had been dreaming. It was lucky that he had a box of lucifers in his pocket, for the lighting of one enabled him to see the time. His watch revealed that it was one o'clock in the morning, and as he had arrived at nine he must have been imprisoned for four hours. His limbs felt stiff as he rose to his feet, and with a yawn he stretched himself. "I can't stay here all night," he muttered desperately. "I'll try what shouting will do;" and shout he did with all the power of his lungs, only to receive no response.