The two trails that Poole was now following—excluding, for the moment, Ryland Fratten—had diverged; one remained in London, the other led to Belgium—Brussels. He had to decide which to follow himself and which to allot to an assistant. His inclination was to give Lessingham the place of honour, but if he were to go off to Brussels now he would be out of touch with events in London—and he had a feeling that events would soon become more rapid. It was possible, too, that though Lessingham’s trail led to Brussels, he himself might still be in London. Poole decided, therefore, to send Sergeant Gower to the address in the Rue de Canetons, whilst he himself investigated the alibis so kindly provided for him by Captain and Mrs. Wraile. Returning to Scotland Yard, he sent for Sergeant Gower and told him to look up the train and air services to the Belgian capital and to be ready to catch whatever would get him there quickest. Gower, who had the reputation of being a walking Bradshaw, replied at once that there was an 8.30 p. m. train from Liverpool Street to Harwich which would get him to Brussels some time after 9 a. m. the following morning. As it was not barely six there would be no difficulty about catching it; what were his instructions? The question at once brought Poole to a realization of the difficulty that confronted him. It was easy enough to say: find Lessingham; but, if found, what was to be done with him? It was not, as yet, a question of arrest; when that time came the Belgian police might have to be called in. It was rather a question of interrogation and Poole wanted to do that himself. For the moment, therefore, he instructed Sergeant Gower to investigate the address; if possible get in touch with Lessingham, and then telephone to him, Poole, for further instructions. He gave certain definite hours at which he would try to be on the end of the telephone at Scotland Yard. When Gower had gone, Poole took a sheet of foolscap and started to work on the Wraile alibis. Assuming for the moment that Mrs. Wraile was the driver of the car, and Wraile the man who had first jostled and then shot Sir Garth, he jotted down the times within which each of them must have been away from their alibi. Reviewing all the evidence as to time, it seemed fairly certain that the accident on the Duke of York’s Steps had taken place at 6.30 p. m., the death a few minutes later. With that assumption the time-table worked out as follows: