The summer season on Pyke Island typically kicks off with a traditional Fourth of July celebration both for the locals and the many tourists who come to sample a taste of Downeast Maine. But it's no picnic for Del Corriveau after she finds human skeletal remains in a remote area of Granite Coast Park in a slab cave with more than one secret. What begins as research into a granite peak instead uncovers a mountain of lies, betrayal, and revenge. Del and her sleuthing friends, Ty and Marco, find themselves caught in the crossfire of an old feud between long-time island neighbors. Meanwhile, their friendship is strained by a new kind of rivalry and rescue is far from certain.