"Kai is angry when he's forced to join his new stepfather, Rick, on a research trip to Blind Bay. On a floating lab in the middle of nowhere. Rick, a marine biologist, is using sound waves to explore deep underwater caves. But they discover that the sound pulses have awakened something. Something that is now hunting them-an ancient predator from the depths of the caves. Soon the tide will turn, unleashing the creature out into the open ocean...and...

Teenager Eliza and her friends are going to explore a cave near their upstate New York home, but first her friends insist on dragging her to Drowner's Swamp, a bog legendary for its dangerous sinkholes, and a place which her mother has frequently warned her about; Eliza does not want to go, and when the earth opens up and swallows her she finds herself in a system of caves--and what she finds living there is strange and dangerous beyond anything the...