Book 2: The Sergeant Frank Hardy Mysteries. New Zealand, 1878: With his new private investigation agency established in Palmerston, Sergeant Frank Hardy is ready to marry, but fiancee Mette Jensen is reluctant to leave her job at the book shop. Then Frank disappears during a case and the man Mette thought he killed to save her appears at the shop looking for someone to investigate the murder. Meanwhile Frank awakes in a mysterious underground prison and must uncover what he knows or has seen that has lead him to this dank cell.