When eccentric billionaire, Ellis Holloway, hires renegade marine biologist, Sam Aston, to investigate the legend of a monster in a remote Finnish lake, Aston envisions an easy paycheck and a chance to clear his gambling debts. But he gets much more. There is something terrible living beneath the dark waters of Lake Kaarme and it is hungry. As the death toll mounts, Aston faces superstitious locals, a power-hungry police chief, and a benefactor's descent into madness as he races to find the legendary beast of the lake.