Lord Honerton is a rich chemist who lives in baronial splendor on his Norfolk estate. At a family dinner, his youngest son gets called by the gatekeeper, who hits him for having a relationship with his daughter. He dies by accident, but the gatekeeper is accused and hung. Thirty years later, Honerton's children suffer a similar episode when the youngest son, Ernest, vanishes. Despite the efforts of Scotland Yard's Inspector Rode and his smart and stunning sister Judith, Ernest is nowhere to be found. Will they trace him and bring him back?