It's summer, and the students of Rookwood School are thrilled to learn of a special trip to Shady Pines Hotel on the shores of Lake Seren. But the old hotel and the waters of the lake are covering up dark secrets. And when mysterious things start happening to hotel guests, it seems that a malicious new threat is haunting Scarlet and Ivy. Locals say that at night you can hear the ringing of the church bells and see lights under the lake. Could it be troubled souls buried in the flooded graveyard who are no longer at rest…?