Under the Polar Ice-Cap... The atomic submarine 'Dolphin' has impossible orders: to sail beneath the ice-floes of the Arctic Ocean to locate and rescue the men of weather-station Zebra, gutted by fire and drifting with the ice-pack somewhere north of the Arctic Circle.

But the orders do not say what the 'Dolphin' will find if she succeeds – that the fire at Ice Station Zebra was sabotage, and that one of the survivors is a killer…

The optimism of the early sixties, infused with the excitement of the space race and the menace of the Cold War, is filtered through the rich imagination of high-spirited, eight-year-old Madeleine, who welcomes her family's posting to a quiet Air Force base near the Canadian border.

Secure in the love of her beautiful mother, she is unaware that her father, Jack, is caught up in a web of secrets. When a very local murder intersects with global forces, Jack must decide where his loyalties lie, and Madeleine will be forced to learn a lesson about the ambiguity of human morality—one she will only begin to understand when she carries her quest for the truth, and the killer, into adulthood twenty years later.