25 JUNE 1965, Page 27

The Third Possibility. By Selwyn Jepson.

(W. H. Allen, I5s.) When a Cabinet Minister is approached by blackmailers, something must be done quickly—and discreetly. Something was —and it was the amateur investigators who out- did the police in drawing all the threads together and linking the blackmailers with a call girl, a subversive Organisation, a John Birchite strong- man from America. And, of course, John Hammond's judo helped. The Black Glass City. By Judson Philips. (Gollancz, 16s.) A brilliantly contrived thriller and at the same time a slash- ing indictment of Filmland's professional key- hole peepers and gossipmongers, who make a star's private life their public business. First-rate. Prinvest—London. By Val Gielgud. (Crime Club, 15s.) The assignment given to the new Investi- gation Agency Prinvest to keep a protective eye on a passenger during an ostensible Aegean cruise, brings to light a design and characters more sinister than at first expected, with remin- iscent overtones of the Profumo affair. Enter- taining. The Duplicate. By H. Baldwin Taylor. (Heinemann, 21s.) A double murder and then suicide by the killer seems an open-and-shut case, but the editor' of a local paper in a small New England town isn't happy about it and decides to follow up a few of the problems that puzzle him. An ingenious thriller, which keeps the tension mounting to the end.