Every Halloween, strange things happen on Willow Street. But this year, Sam and his friends uncover the mansion's deepest mystery—a riddle that leads them to a group of playful, trapped ghosts. After freeing the spirits, the adventure seems over—until they discover a hidden key that opens the door to something much older and darker than the mansion's curse. With the key pointing them toward the forgotten city of Valemont, they embark on a new journey filled with ancient secrets and dangerous magic. In their search for answers, they face the ultimate question: What happens when history's darkest secrets come to light?