I just finished
The Remaining
It's about a secret US Military guy who's job is to go into his government built bunker anytime something crazy happens in the world "just in case". 9/11 type events, etc.
In the book he is sent down due to a virus outbreak. He stops getting transmissions from his handlers and comes back up to start his job.
I'll give you a hint...
The infected turn into hyper-aggressive predators, with an insatiable desire to kill...
Yup a zombie book. It's pretty darn good.
Rent it for free from Amazon if you have Prime.
I will start the second book tomorrow.