The mayor flipped a lever, and everyone cheered as Old Lower Grange was submerged beneath five thousand swimming pools’ worth of water. But Cassie’s family wasn’t there to see it — they were too busy rushing to the hospital to deliver an eight-weeks-early Cassie. Now, twelve years later, Cassie feels drawn to the mysteries hidden beneath the surface of the manmade lake — and she’s not the only one. Her classmate Liam, who wears oversize swim trunks to cover the scars on his legs, joins Cassie on the lake’s forbidden side. As the summer heats up, the water drops lower and lower, offering them glimpses of the ghostly town and uncovering secrets one prominent town figure seems anxious to keep submerged.