A young lady is hired as governess for two children. But, when she arrives to start her job, she discovers that the two are not children at all but young adults that are kept inside an old house and treated as if they are 10 years younger than they really are.

Add a ghost and murder to the story as well as the nanny's desire to find out who has a reason to keep the young people hostage in their own home and you have the ingredients for this strange mystery. 