Where Trouble Leads (Jennifer Bannon #3) by Barbara Chapman

Fifteen-year-old Jennifer Bannon agrees to spend her summer as a camp counsellor at White Pine Camp with her best friend Ambie and her younger sister Leslie. But Jennifers summer in the isolated wilderness on Georgian Bay turns into a roller coaster ride of suspense and danger. Not all is as it appears, and Jennifer is quickly entangled in camp mysteries and the deep secrets of girls assigned to her cabin. There are mysterious after-lights-out activities and strange people who catch Jennifers eye, including a particular male counsellor. When Jennifer discovers somebody lurking in the woods past curfew, she knows that her first responsibility is to the girls in her charge, but she is nevertheless determined to find out what lies beneath the surface. What she discovers in the woods leads her to believe that someone is smuggling drugs and using the camp as a cover-up. As the summer heats up, suspense reaches a boiling point, and Jennifer must race to solve the mysteries of White Pine before tragedy rocks the camp.