Thirteen year old Coriander Jones expects another summer as usual at Happy Haven, a run-down summer camp for "underprivileged youth." But when the bus ride doesn't go as planned, she discovers that she is part of a centuries-old organization that battles ancient deities known as the "Old Ones." Happen Haven serves as ground zero when the oldest of the Old Ones comes calling, determined to breach the barrier that keeps them at bay.
Along with her little sister and best friend, Coriander also joins forces with her former enemy, mean girl Olivia, and the mysterious teenager Cole, whose secret agenda puts the team in more peril. Juggling nosy counselors, homicidal maintenance men, and the first annual Happy Haven Color War, Coriander may save the world, if she can survive summer camp.