Ian Mackenzie is awakened at Kilmorgan Castle one night to find robbers stealing the priceless art collection of his oldest brother, Hart. Since Ian and Beth are the only ones in resident at Kilmorgan at the moment, Ian decides he must find the art and the culprits before the family shows up for Hart's birthday gathering. With Inspector Fellows and Beth, he investigates, though Ian is somewhat worried by Beth's late husband's brother, a retired missionary, who decides to visit. Does John Ackerley hold the "cure" to Ian's madness? And can Ian discover what has happened to Hart's treasures, and who is targeting the Mackenzies before the enemy strikes again?

Return to Kilmorgan Castle to visit the Victorian branch of the Mackenzie family, and catch up on the brothers and friends, their children, and their lives.