Shepherd's watch Shepherd & Wolfe Series, Book 2.

The boys are back! Tony Shepherd's relaxing summer at the lake with his family crashes to a halt when Charlie Wolfe arrives at the cabin after a local man goes missing. Nothing is ever simple when Charlie's around, and soon the boys are caught in a dark tangle of violence and danger. If they're not careful, their search could bring harm to more than just themselves... Can Tony protect his family and Charlie?