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.