Mrs. Bradley decides to visit her old friend Isobel Marchmont, but soon after her arrival realizes that not all is well. Her friend's daughter Lacey Prideux is pregnant again having given birth only in the last year and the servants are familiar. When the cook is poisoned, Mrs. Bradley and George must first determine the secrets of the house but are unable to do so until before two more of the occupants are killed. George realizes that Douglas Prideux commanded his late brother who died in World War I and has a number of questions he wants answered. .