I got it all out of him, little by little. On the voyage from Cape Town to England one of the passengers had handed him a roll of films with instructions that they were to be dropped onto the bunk in Cabin 71 at 1 a.m. on January 22nd on the outward journey. A lady would be occupying the cabin, and the affair was described as a bet. I gathered that the steward had been liberally paid for his part in the transaction. The lady’s name had not been mentioned. Of course, as Mrs. Blair went straight into Cabin 71, interviewing the purser as soon as she got on board, it never occurred to the steward that she was not the lady in question. The name of the passenger who had arranged the transaction was Carton, and his description tallied exactly with that of the man killed on the Tube.

So one mystery, at all events, was cleared up, and the diamonds were obviously the key to the whole situation.