'All these people who thought themselves securely in possession are now going to be dependent on the caprice of this young man.' During a blinding rainstorm, Jake Seaborne takes a wrong turn and arrives at Ullstone Hall, where is he is initially mistaken for 'Hugo', the new heir to the family estate. It seems Hugo is the offspring of the late Mr Ullstone's first marriage in India, but the children of his second marriage have never met him. In short, the Ullstone family destiny is now in the hands of a complete stranger. A friend, Sir Frederick Lawson (who it turns out knows Jake's family) has been asked to act as a "sort of buffer" for Hugo on his arrival, but Lawton cannot stay and Jake agrees to act in that role until he can return. But not everything is as it appears to be, and when the handsome and charming Hugo arrives, trouble follows and before long three people are dead.