When Uncle Quentin's life's work is stolen from Kirrin Cottage, the Famous Five take the night train to Scotland and are drawn into a deadly game of espionage, theft and deceit.

The children protect a circus magician from an unscrupulous doctor.

The Five are reunited by mysterious letters sent by an old friend at the spooky Prospect Hotel. Their mission? To solve a murder. The twist? It hasn't happened yet.