At the end of each year, four pupils from Cyril Sniggs’s Correctional Orphanage for Wayward Boys and Girls are banished to Sin Bin Island, an eerie place surrounded by eel-infested waters. Legend has it, the island has a secret tunnel, used to smuggle magic into mainland England. But in over 300 years the tunnel has never been found. Nor has any of the magic. This year, all that’s going to change.