Alfie is shocked by the arrival of new teacher Kevin Schwimer at Abbey Grove and even more shocked to learn that he will be taking over Alfie's own class. Desperately upset that his class seem to be having a great time and actually learning proper, real-life GCSE history with their new teacher, Alfie is even more unhappy when he finds out which class Miss Pickwell has given him instead. With headmaster Fraser and Miss Gulliver both increasingly charmed by Mr Schwimer it is left to Alfie and Jing to uncover the truth behind this American imposter.