Sophie can't remember how she got here, but she knows she has to escape. The dollhouse is a puzzlebox of horrors, each floor with traps and terrors set on keeping her there.
On a school trip to Dartmoor, Sophie is a little suspicious about where they are staying, especially when she believes it to be haunted. So when her class are trapped there, she knows it is not going to be fun.
(Please check out the sequel, School of Magic, as well)