James will do anything to save his sister. After fighting to reach the army-secured medical building with his crew, he’s relieved she’s managed to fend off the infection. But it slices his happy reunion short when a sea of dead breach their barricade.

As zombies smash their way up through the floors, his stomach plunges when he discovers the secret to saving humanity lies outside the blockade. And the only means to retrieve the data is for James and his faithful dog to descend into the hellish battleground.

Can James keep both his sister and the cure safe, or will the murderous mob rip humanity’s last hope to shreds?

Immune is the fourth book in the dark Dead State post-apocalyptic series. If you like determined characters, unrelenting undead armies, and high-stakes escapes, then you’ll love Derek Shupert’s gritty tale of desperation.

Get it now.