When John Appleby's wife, Judith, sets eyes on Scroop House, she insists that they introduce themselves to the owners - a suggestion that makes her sometimes reserved husband turn very pale. When Judith hears the village gossip about the grand house, she is even more intrigued, but when a former employee is found dead in the lock of the disused canal, and the immense wealth of Scroop's contents is revealed, Appleby has a gripping investigation on his hands.