One person from 4 different families have a possessed music box thrust upon them by a dead witch that has been stalking their families for 200 years. They have 7 days from receipt to lock them down. They must meet and battle the witch for the keys on her home turf. If they don't find them in time, if at all, the demon possesses them. A long lingering death. Age is not a consideration.
Definitely will be reading book 2.