The story takes place on the ice planet of Nulun, where Commissar Cain and his Valhallan Ice Warriors are sent to investigate strange occurrences. What ensues is a thrilling tale of mystery, action, and intrigue, with plenty of humor and wit. As with previous books, Mitchell's writing is engaging, and the story is full of unexpected twists and turns.

Don’t listen to the propaganda of the Imperium. Listen to the truth: Ciaphas Cain is a coward, but he is our coward.