On February 14, someone works out a scheme for murder and fixes a date in September. During the summer, others in the cast of the events to come make their holiday plans. In September, Mr. Treves, London solicitor, finds himself in a comfortable hotel near Gull’s Point, homeof Lady Tressilian. Gathered int he house is an assortment of guests: Neville Strange, well known athlete and Lady Tressilian’s heir; his beautiful wife Kay; his divorced wife Audrey; and Thomas Royde, an old friend of the family on leave from Malaya. Kay’s decorative friend Ted Latimer is staying at a hotel across the estuary. And in the background, the incorruptible journalist McWhirter. The stage is set for murder, and events are moving inexorably towards zero.