The Unpleasantness at the Bellona Club by Dorothy L Sayers

Sleuth's Incorporated's report, when it came, might be summed up as "Nothing doing and Major Fentiman convinced that there never will be anything doing; opinion shared by Sleuths Incorporated. " Lord Peter's reply was: "Keep on watching and something will happen before the week is out."

His lordship was justified. On the fourth evening, Sleuths Incorporated reported again by telephone. The particular sleuth in charge of the case had been duly relieved by Major Fentiman at 6 p.m. and had gone to get his dinner. On returning to his post an hour later, he had been presented with a note left for him with the ticket-collector at the stairhead. It ran: "Just seen Oliver getting into taxi. Am following. Will communicate to refreshment-room. Fentiman. " The sleuth had perforce to return to the refreshment room and hang about waiting for a further message. "But all the while, my lord, the second man I put on as instructed by you, my lord, was a-following the Major unbeknownst. " Presently a call was put through from Waterloo. "Oliver is on the Southampton train. I am following. " The sleuth hurried down to Waterloo, found the train gone and followed on by the next. At Southampton he made inquiries and learned that a gentleman answering to Fentiman's description had made a violent disturbance as the Havre boat was just starting, and had been summarily ejected at the instance of an elderly man whom he appeared to have annoyed or attacked in some way. Further investigation among the Port authorities made it clear that Fentiman had followed this person down, made himself offensive on the train and been warned off by the guard, collared his prey again on the gangway and tried to prevent him from going aboard. The gentleman had produced his passport and pieces d'identite, showing him to be a retired manufacturer of the name of Postlethwaite, living at Kew. Fentiman had insisted that he was, on the contrary, a man called Oliver, address and circumstances unknown, whose testimony was wanted in some family matter. As Fentiman was unprovided with a passport and appeared to have no official authority for stopping and questioning travelers, and as his story seemed vague and his manner agitated, the local police had decided to detain Fentiman. Postlethwaite was allowed to proceed on his way, after leaving his address in England and his destination, which, as he contended, and as he produced papers and correspondence to prove, was Venice.