'Murder Plan Six', described by the 'Evening Standard' as 'a thriller of a very high (and rare) order', is by John Bingham, whom many will remember as the amiable father of Charlotte Bingham in 'Coronet Among the Weeds'. If the story is raather less than amiable, it is nevertheless rather more than unusual, with its introduction of Victor Gollancz, the very real and very well-known publisher, as one of the main characters, toghether with two fictitious authors of the Gollancz 'stable' and two women, of whom one is an angel and the other the very devil. When a note of madness creeps in - happily among the fictitious characters - things are bound to get out of hand, and they do it with a tension that winds up tighter and tighter as time and the tape-recordings run out.