"On the mysterious Summer Isle, siblings Max and Carter discovered the magical land where the villainous Pied Piper led the children of Hamelin centuries ago. But after a desperate battle with a cruel magician, Max and Carter found themselves separated: Max with their new allies (human and trollson alike), Carter with ... the Piper. Now Max is determined to reunite with her lost brother and escape the Summer Isle once and for all. Yet the wicked Grannie Yaga holds more sway on the island than anyone might suspect--and she has set her sights on Carter. Max and Carter must foil Grannie Yaga, rescue the children on New Hamelin, and find their way back home. But what role will the Piper play when his secrets are finally revealed?"--Dust jacket flap.