Anna-Jane couldn’t wait for camp. But when the outside world goes dark, she and her friends soon realize they’re in for the adventure of their lives this summer—and maybe even beyond.

Anna-Jane is thrilled to be back at Camp Chester—the one place she feels like she belongs. She’s excited to swim in the lake, read in her favorite chair, and swap secrets with her best friend under the stars. But not long after Anna-Jane unpacks her trunk, weird things start happening.

First, townspeople near camp begin disappearing. Then, the internet, cell service, and all other forms of communication are cut off. Soon, Anna-Jane and the residents of Camp Chester realize they are completely alone.

Or so they think. Across the lake, the kids spot a strange flashing light. And when animals begin turning up with yellowed eyes and disfigured limbs, it is clear the dangers are only growing. Most alarming of all, though, is the deepening distrust among the campers themselves, which could have deadly consequences. Anna-Jane knows what to expect from a summer at camp . . . but what happens when camp lasts well beyond the summer?