Harry, Ron and Hermione were all in the Gryffindor common room when Harry started reading a book about when his parents were at school. However, when Hermione's spell went wrong, it sent them back in time, when Lily Evans-potter (Lily Evans then), Professor Severus Snape, James Potter, and the Marauders were at school. Slowly, the trio began seeing how the Marauders and Snape grew, and their rocky friendship.