It is extremely addictive and action packed. Witness humanity fight some of the worst monsters in the world. Currently a five book series with a sixth book coming out soon, Extinction Aftermath. 

THE EXTINCTION CYCLE: EXTINCTION HORIZON – BOOK 1
The worst of nature and the worst of science will bring the human race to the brink of extinction.

Master Sergeant Reed Beckham has led his Delta Force Team, codenamed Ghost, through every kind of hell imaginable and never lost a man. When a top secret Medical Corps research facility goes dark, Team Ghost is called in to face their deadliest enemy yet a variant strain of Ebola that turns men into monsters.
After barely escaping with his life, Beckham returns to Fort Bragg in the midst of a new type of war. The virus is already spreading. As cities fall, Team Ghost is ordered to keep CDC virologist Dr. Kate Lovato alive long enough to find a cure. What she uncovers will change everything.
Total extinction is just on the horizon, but will the cure be worse than the virus?