Shadow of the alchemist (#2). Fünaro Gregory

Oliver and Lucy Tinkers are guardians of the old Blackford House mansion. Together with the father, they make sure that the magic clock is working (otherwise evil can penetrate our world and destroy the mansion!), And consider Blackford-House their own. But once Agatha and Elrinon Kojima come to the mansion, who claim that they are the legal heirs of this house! And soon black magic penetrates inside, turning the house into a constantly changing maze. The guys will have to act together and prevent evil from using the forces of a dark amulet hidden somewhere in the walls!