When the world of Quadravidia comes under attack by the insidious tau, only one man can defeat the aliens and save the planet in the Emperor's name: the legendary Hero of the Imperium, Commissar Ciaphas Cain. When the aliens call for a ceasefire, Cain expects the worst, and his fears are answered in the form of the dread menace of the tyranids. As a hive fleet approaches Quadravidia, Cain must try to forge an alliance between the Imperium and the tau - but can he truly trust the inscrutable xenos?

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Treacherous tau, terrifying tyranids and the irascible Commissar Cain it all adds up to a classic tale from the master of Warhammer 40,000 comedy-action.