Nine-year-old Morgan is helping guard a magical secret- an ancient medallion of great power. During a voyage on the high seas with her friend Rusty, the two encounter a monstrous sea creature and menacing sailors. Will they be able to save each other from the dangers facing them? And who is the traitor in their midst? Set in the early summer of 1899 off the coast of Nantucket, Morgan and the Monster of the Deep...