James Potter was determined to help his friend Remus Lupin endure the loneliness of his werewolf transformations. With Sirius Black and Peter Pettigrew, he sought a way to roam Hogwarts unseen, uncovering hidden passages, secret rooms, and ancient magic. Their efforts birthed the Marauders' Map; an extraordinary tool born of friendship, mischief, and a desire to protect one of their own. But the magic they awakened had a life of its own, holding secrets that would outlast them all.