A shrieking, killing nightmare erupts from an overgrown well, hidden in the grounds of an old house, Tranchard's Folly - and Mary Shelley, the Doctor's latest travelling companion, rescues teenage twins Finicia and Lucern from the clutches of the monster. But a TARDIS trip in search of the origin of the horror goes terribly wrong.
This book is part of the Doctor Who: Big Finish Monthly Adventures Audio Books series and is book #55 in the series.