Twenty one days. That was all mechanic Liam Thorne had left to serve at HMP Blackwood before walking back to his young daughter. But when a black-market neuro-stimulant called Apex breaches the concrete walls, the prison detonates into an abattoir. The infected don’t feel pain; they don’t tire; they only hunt. With the facility under total lockdown and the virus tearing across a burning mainland, Liam must carve a desperate path through claustrophobic corridors, gridlocked dead zones, and streets choked with the rabid. To honour a promise to the only thing he has left in this world, he’ll have to outrun an apocalypse that is swallowing Britain whole.