He stopped only to get a call through to London, and, by great good luck, found the Dover-London wire disengaged. The boat was crowded, and he was no sooner on board than he saw how impossible it was to make sure that Gordon was not on the boat by a search whilst the ship was in port. The _Princess Juliana_ carried Bobbie to sea. He arrived at Ostend at four o’clock in the afternoon, having satisfied himself that, although there were many suspicious characters on the ship, Gordon and Mrs. van Oynne were not two of them. He spent two hours seeking the British Vice-Consul and persuading that gentleman to give him the necessary certificate to be readmitted, and to placate the passport officer on the other side, who had already been notified of his unauthorized departure. Very few of the Ostend hotels were open, but Bobbie made a tour of all, examining their visitors’ books. Gordon was not in Ostend. That was a relief. He might have changed his mind at the last moment and gone to Paris, but that was unlikely. Bobbie believed his brother, though he imposed the limit of strain upon his credulity. He returned to Dover by the night boat, and came in the grey dawn to the port, where he was held for two hours by the outraged passport authorities, missing the boat train and finally catching a slow train from the town station. He arrived in London at ten, unshaven, weary and irritable, and he did then what he might well have done at first--he drove straight to Scotland Yard, and, fortune favouring him, found Inspector Carslake in his room. Carslake and he had been in France together, and for twelve months had worked side by side in the Intelligence Bureau, where enemy regiments were identified and their positions plotted, by methods which would have puzzled cleverer people than my dear Watson. As briefly as possible Bobbie told his story, and the inspector listened with unusual interest. “It’s curious you should come to me. I have charge of the Double Dan cases, and I must say that this looks like a typical coup of his.” “Gordon isn’t an easy man to impersonate,” warned Bobbie, “though I told him he was when I was trying to scare him.” “Anybody is easy to Double Dan,” said Carslake at once. “Tall, short, thin or fat. He’s a specialist--the only man at the game as far as I know. You didn’t see the woman, Mrs. van Oynne?” Bobbie shook his head. “Do you know where she lives?” “I haven’t the slightest idea.” “He will do nothing till Monday,” said Carslake thoughtfully. “Dan only works in banking hours, but when he does work he moves! I take off my hat to Dan--he’s clever.” “Who is he?” “A man named Throgood. He used to be an actor--I believe he’s played opposite some of the best people in America. He was the English dude type. He himself is English or Welsh. His partner is an American or a Canadian, and an ex-chorus girl. Maybe it’s the same--rather slight, short, with golden hair, blue eyes?” Bobbie shook his head.