When Tanya arrives to spend the summer at the manor, she notices that Rowan is acting strangely and becomes determined to find out what she's hiding. As Rowan sets out on a risky secret quest, those she is working with soon begin to vanish one by one -- each in a way that is symbolic of the Thirteen Treasures. With time running out, will Tanya be able to prevent the past from consuming Rowan altogether?