As they fight to stay alive, Jim and Selena discover that the infected have evolved into even more terrifying creatures, with increased strength and agility. They also stumble upon a hidden underground bunker, where they find a small group of survivors who have been living in safety.

The story concludes with Jim, Selena, and the group of survivors setting out on a perilous journey to find a cure for the new strain, hoping to save what's left of humanity from extinction.

It's been 28 weeks since the outbreak of the rage virus that devastated London and the rest of the world. The virus, which was highly contagious and airborne, caused its victims to become violent and aggressive, leading to a rapid breakdown in society.

The group sets out to retrieve the serum, facing numerous challenges and dangers along the way. They encounter hordes of infected, including the notorious "Wolverine" infected, who are faster and more agile than their predecessors.

The group manages to retrieve the components needed for the new vaccine and work together to create it. However, just as they are about to administer the vaccine, they are ambushed by a large group of infected.

As they navigate through the lab, they discover that the serum has been compromised, and they must find an alternative solution. Dr. Munce reveals that he has been working on a second vaccine, one that can prevent the virus from spreading further.

In the ensuing chaos, Jim, Tammy, Andy, and Dr. Munce are separated, and Jim finds himself fighting for survival alongside a new ally, a tough and resourceful woman named Selena (Rose Byrne).