THE PUZZLE OF BLACKSTONE LODGE is a complexly layered mystery perfect for fans of impossible mysteries inspired by Agatha Christie. Martin Edwards pens the perfect locked-tower puzzle with a gothic edge set in 1930s Northern England.

1930: Nell Fagan is looking for a second chance at a career in investigative journalism, and the call of Blackstone Fell's sanatorium is irresistible.

In 1606, a man vanished from a locked gatehouse in a remote Yorkshire village, and 300 years later, it happened again. Nell confides in the best sleuth she knows, Rachel Savernake.

Looking for answers, Rachel travels to lonely Blackstone Fell in Yorkshire, with its eerie moor and sinister tower. With help from her friend, Jacob Flint --- who's determined to expose a fraudulent clairvoyant --- Rachel will risk her life to bring an end to the disappearances at Blackstone Fell where people go in but never come out.