It is summer and as a special treat after the horrors of last term Mrs Knight announces a school trip to Shady Pines Hotel on the shores of Lake Seren. Scarlet and Ivy are thrilled to get away from Rookwood for a break! But the old hotel and the waters of the lake reservoir are covering up dark secrets. And when mysterious things start happening to hotel guests it seems that a malicious new threat is haunting the girls. Locals say that at night you can hear the ringing of the church bells and see lights under the lake, that troubled souls buried in the flooded graveyard no longer rest.