Nicholas Fisk/NIghtmare Fuel

• Grinny. Ye gods,Grinny. The novel is told in the form of a diary by one of the children, detailing the visit of Great Aunt Emma. She seems 'off' right from the start—the childrens' parents don't remember her until she tells them they do, she's frightened of electricity, can sense emotions and smiles all the time. The Nightmare Fuel comes later, when she breaks a wrist and the children see that she is not quite human. And when they try to warn their parents and they don't believe them? They have to get together and kill her themselves.