DI Ivan Winterman is a man with a troubled past. The Blitz has left his young son dead and his wife seriously injured. He has made enemies in high places and, with his career going nowhere, he returns to his home town in East Anglia, seeking to rebuild his life in a country gripped by post-war austerity and the coldest winter on record.

As the first snow begins to fall, a drunken ex-clergyman stumbles on the semi-mummified body of a small child concealed in a ruined cottage. Days later, a second similar child's body is found in a Fenland dyke. Both bodies have been dead for several years, preserved in the Fens, the cause of death unknown.

Winterman, supported by a small team of assorted misfits, finds himself leading the investigation, uncovering a web of connections and secrets in the small rural community. When a further murder victim is discovered, Winterman discovers that the secrets are darker and the threat far more immediate than he'd ever envisaged.

And, as the snow finally begins to thaw over the Fens, Winterman realises that his worst nightmares are about to come true…