Agnes lives in the Magrei forest tribe. The people of her village are born with some extraordinary gift. Once they have discovered and mastered their gift, they must demonstrate it at the Full Moon Festival and swear an oath to use the gift for the benefit of the entire tribe. The only problem is that every Magrei must take this vow by the age of twelve or they will become a Shadow. Agnes just celebrated her eleventh birthday. And unlike the others, she still has no idea what her gift is. He therefore embarks on a dangerous journey to the Forbidden Mountain. To the same mountain from which her father did not return five years ago.