The Witch Apprentice by Marian Broderick. Deep in the cellars of the O’Brien Press is a safe that contained stories too horrible to be read. But somebody has broken into that safe and the stories have been released. This is one of those Forbidden Files. There’s something very odd going on in Anna Kelly’s new home – her guardians, Grizz and Wormella Mint, are witches, and they want Anna to help them with their nasty spells! So Anna’s stuck in their horrible house, chopping up toadstools and scrambling frogspawn, with no one but Charlie the cat for company. Is there any way out for her? But then she finds an evil, old spell book in the cellar – can Anna make the magic work for her?