After the events of Deep Water, scientist Katie Flanagan has gained an undeserved reputation as a troublemaker. Her research career has foundered. When an accident creates an opening at an Antarctic station, she seizes the opportunity, flying in on the last plane before winter and the months of darkness close off all escape routes. Unfortunately for Katie, a revenge-seeking killer is at large at the station.
Meanwhile patent lawyer Daniel Marchmont has been asked by a venture capitalist to conduct background research into a company involved in Antarctic experiments. His investigations threaten to uncover scientific fraud and expose powerful individuals, some of them at the Antarctic station. Hitting too close to the truth, Daniel's sleuthing puts Katie in fresh danger.
Then the power at the research station fails. Will the killer help save them all . . . or kill them one by one?