The Calculus of Battle

The beleaguered Astra Militarum defenders of Varasine fight against the alien menace of a tyranid invasion, but their only possible salvation approaches in the form of something almost equally inhuman. Warleader Kardan Stronos of the Iron Hands, long having studied the xenos threat, now brings his fearless battle brothers to join the war - only he can save Varasine, measuring his Chapter's infallible logic and ruthless strategy against the cost in human lives.