Herbie Lemon, Lost-and-Founder at the Grand Nautilus Hotel, and his fearless friend Violet Parma have unearthed many secrets in their village of Eerie-on-Sea: secrets lurking beneath the waves, lapping onto the beaches, and lying behind locked doors. When their brilliant and ruthless nemesis, Sebastian Eels, returns with a plan to open the long-shuttered waxworks museum, Herbie and Violet suspect nefarious motives. Their investigation leads them into the dark Netherways below the townand into the tragic past of the famous toymaker and inventor Ludovic Festergrimm and his doomed daughter, Pandora. Sebastian Eels is convinced that within the story of Festergrimm is the key to Eeries deepest secreta secret in which Herbie himself plays a crucial partand he'll stop at nothing to uncover it, including bringing a terrifying clockwork legend back to life.