Sarah Jane, Rani and Clyde meet up with Professor Celeste Rivers and her young assistant Toby at the supposedly haunted Ashenhill Manor where, in 1665, the two children of its owner, Lord Marchwood, were allegedly made to disappear by a sinister alchemist called Erasmus Darkening. Indeed Professor Rivers also vanishes from the manor's nursery, where the toys come to life and the message 'Get Out' appears. Rani and Clyde discover a secret passage which leads to Darkening's laboratory, whilst Sarah Jane is saved from a marauding creature by the shade of Lord Marchwood himself.
