Phillipsport, Maine, is a quaint and peaceful seaside village. But when hundreds of creatures pour out of the ocean and attack, its residents must take up arms to drive the beasts back. They are the Clickers, giant venomous blood-thirsty crabs from the depths of the sea. The only warning to their rampage of dismemberment and death is the terrible clicking of their claws. But these monsters aren't merely here to ravage and pillage. They are being driven onto land by fear. Something is hunting the Clickers. Something ancient and without mercy.