Fifty-second in the long running series with Dr Priestley.

The first murder was discovered in a dingy office at the top of a rickety London tenement. The victim was unknown, probably a foreigner. The second happened in a first-class compartment of a train out of London. This time the victim was a popular M.P. Superintendent Jimmy Waghorn of the Criminal Investigation Department, with the help of Dr. Priestley, discovered the connection between the two crimes; but the mysterious Mr. Felthorpe, with his secret meetings, knew more than either of them. Here is John Rhode at his best in an up-to-the-minute story of sinister crime and intrigue in the heart of present-day London.