The Piccadilly murder

Has Mr Ambrose Chitterwick witnessed suicide or murder at the Piccadilly Palace Hotel? Chief Inspector Moresby of Scotland Yard believes Major Sinclair, her nephew and heir, poisoned the old lady, and he has Chitterwick down as chief witness for the prosecution. Chitterwick finds himself drawn ever deeper into the case following a succession of unexpected twists and turns of the plot... Book jacket.