Coldbrook

Coldbrook is a secret laboratory buried deep in the Appalachian Mountains. Its scientists have done what no one thought possible and opened a gateway to another world. They expect it to be the greatest discovery in human history.

They are wrong about what they have let through. A disease comes with the breakthrough, and it spreads out of the facility into the wider population, killing billions and turning the dead into zombies.

The only hope is a cure, and the only route to one is genetic resistance: someone who has stayed uninfected among the dead. In the chaos of the collapse, one woman may be able to save the human race. The question is whether anyone can reach her before the disease finishes its work.

This is a zombie apocalypse novel that blends horror with science fiction, built on a parallel-universe premise. The tone is dark and the pace is fast, driven by a search with a clock running against it.