With the end of the war behind them, a new threat besieges London as the citizens struggle through the onslaught of relentless hardships. Vincent Bonner is a British sniper, having been discharged from service with the knowledge that his time was ticking to the end. With one last fight set before him, he aims to end this new war before his inevitable demise. In a literal fight to the death, with his best friend and closest companion Vukašin Babić by his side, they will face the tide of battle to thwart this hidden enemy one last time.
In The Decay, the journey is hard when coming to terms with grief, and accepting the inevitable fate of chronic illness. The impact on relationships is a hardship shared as Vincent comes to terms with his encroaching end. With a family found and forged in the aftermath of a war, he discovers that home isn't just the place one grew up in. It's the people around him, and the ones he loves and trusts dearly.