... : T^eviewed by Noel Thompson HEIGH-HO for a cheery bunch of books this month in which the war plays little part. For the most part our novelists seem to have said to themselves, Let us be gay, thereby anticipating Mr. A. P. Herbert's famous postscript. Of course Agatha Christie, despite the murders inherent in her novels, always writes with a light touch, but her latest Hercule Poirot story ...