Ever since his mom died, Jonothan has been on his own, living on the streets, kicked out by the landlord. The Underground gives him a place to sleep, but it's not like having a real home or being a regular kid. After stealing some hockey equipment, Jonothan, otherwise known as Mouse, picks up his old hobby, hockey, and joins a hockey team. But what to do with his other problems like eating, and paying the owner of the Underground? And what to do when he gets kicked out of the Underground?