Luna Lovegood's twin sons Lorcan and Lysander Scamander board the Hogwarts Express for their first year at Hogwarts. But the twins' close relationship comes to an abrupt end when they end up in different houses. With the help of Bill and Fleur Weasleys Hufflepuff son, Louis Weasley, Lorcan finds a secret room when they become lost on the way to class...