Twelve years ago Claude Carlice was found dead of a gunshot wound. The verdict was suicide brought on by a fit of insanity, but his sister Isabel has never believed it. Now the day approaches when Claude's son Ronnie will come of age and take possession of Carlice Abbey. Preparations for the birthday party are underway, but it will not be a festive occasion: Ronnie, who has imbibed Marxist ideas at Oxford, intends to throw his aunt and stepmother out of the house and sign the entire estate over to the Communist Party for use as a propaganda centre. As tensions rise and the big day arrives, a strange series of events will unfold, revealing the scandalous truth behind Claude's death and resulting in an unexpected fate for Carlice Abbey and its occupants...