In his family life, Angus Stonefield had been gentle and loving; in business, a man of probity; and in his relationship with his twin brother, Caleb, a virtual saint. Now Angus is missing, and it appears more than possible that Caleb--a creature long since abandoned to depravity--has murdered him. Hired to find the missing man, William Monk puts himself into his shoes, searching for clues to Angus's fate and his vicious brother's whereabouts.