The Alchemist's Shadow (Watch Hollow, Bk. 2)

Having defeated the Garr, a vicious tree monster who lived within the enchanted woods of Watch Hollow, Lucy and Oliver Tinker now have the home they’ve always dreamed of: Blackford House. Powered by a magical clock and full of curious rooms and improbable knickknacks, Blackford House brims with the promise of new adventures.

Yet when a strange governess arrives from England—bringing with her the Kojima twins, Agatha and Algernon—the Tinker children’s once bright future quickly begins to dim. The Kojimas claim to be the rightful heirs to Blackford House, and soon after their arrival, a great evil enters the Tinkers’ new home, cursing it and turning it into an ever-changing labyrinth.

As a result, Lucy and Oliver, along with their clock animal friends, must now join forces with the twins to escape this labyrinth and save Blackford House, all while a new monster lurks around the corner.