Spine-chilling Warhammer Horror novel set in the Warhammer 40,000 Universe. The planet of Theotokos is dying of thirst. For years, Arch-Deacon Ambrose has done everything in his power to help the people. Charismatic, virtuous, pious, he is as beloved as the corrupt Cardinal Lorenz, who hoards the water reserves beneath the Ecclesiarchal Palace, is feared. When Lorenz dies, Ambrose's moment has arrived. As good as his intentions are, he is also proud. He will be the saviour Theotokos needs, and bring the relief of water to the suffering. But there is something worse than drought to come.

Lorenz's death unleashes a terrible plague, soon to be known as the Grey Tears. As Ambrose struggles to save Theotokos from the Grey Tears, the unnatural nature of the plague becomes clearer and clearer, and he is driven to more and more extreme measures. He fears malign forces lurk behind the Grey Tears. The truth is worse than his most awful imaginings.