Just when Measle thinks his life is getting back to normal, he, his baby sister, and Tinker the dog are whisked off to a creepy castle. The castle is supposed to keep them safe from the horrors outside, but what about all the horrors that are waiting for them inside? Just what is that group of whispering warlocks really up to? And what do they want with Measle and his family? Once again, Measle finds himself battling against terrible forces of evil magic in order to save his family - and this time he's got to take care of his baby sister too (or is she really taking care of him?) . . . An action-packed romp through the atmospheric and spooky setting of Caltrop Castle which will leave readers breathless.