Festergrimm

Festergrimm is the fourth book in the fantasy adventure series Legends of Hell by British children's author Thomas Taylor.

Herbie and his fearless friend Violet have already uncovered many of Hell's secrets, hidden beneath the waves, lost on the beach, and locked behind secret doors. But Sebastian Vugors has returned to town, thrusting the heroes into a new dangerous adventure involving a missing girl, a creepy museum, and a dangerous clockwork robot.

The investigation leads Herbie and Violet to the abandoned wax museum Festergrimm—and the tragic past of its owner, a famous toymaker and inventor. Vugors is convinced that Festergrimm's story holds the key to the deepest secret of the Sea Hell—a secret in which Herbie himself plays a crucial role—and Vugors will stop at nothing to get his hands on that secret.