A young French immigrant having trouble at her new school, uncovers a mystery about a girl, the former occupant of her school locker, who died in 1968.
Karin and her brother Billy spend most of their time on the unused 13th floor of their apartment building, but one day, they visit the floor and find out it isn't the same.
Two boys from a tough city move into the neighborhood where a group of friends invite them to play a game of hide and seek along with seeking a ghost known as Old Man Corcoran.