Meet Pirio Kasparov, an acerbic Boston-bred girl with a moral compass that points due north. When the fishing boat Pirio is on is rammed by a freighter, she finds herself abandoned in the North Atlantic. Somehow she survives nearly four hours in the water before being rescued by the Coast Guard, but her fisherman friend Ned, the boat's owner, is not so lucky. Compelled to look after Noah, the son of the late Ned and her alcoholic prep school friend, Pirio can't shake the suspicion that the boat's sinkingand Ned's deathwas no accident. Before long Pirio begins unraveling a lethal plot involving the glacial whaling grounds off Baffin Island. In a narrow inlet in the arctic tundra, Pirio confronts her ultimate challenge: to trust herself.