Blood Covenant — Lisa Harris

When fighting erupts between government forces and renegade Ghost Soldiers deep within the Republic of Dhambizao, thousands are forced to leave their homes. Dr. Paige Ryan is sent to lead a team to set up a refugee transit site. Nick Gilbert joins the team to help fly supplies in and out of the area.
With the refugee camp already experiencing overcrowding, raids, and uprisings, a group of American mountain climbers is attacked by the Ghost Soldiers. Paige's medical team rescues survivors and takes them into the camp. When it's discovered that one of the trekkers is carrying an infectious disease, the harrowing conditions of the camp are forgotten. In desperate need of vaccines and the Ghost Soldiers blocking the only road out until their demands for amnesty are met, it won't be long before the disease is out of control . . . and there is nowhere to run.
With her second book in the Mission Hope Series, Lisa Harris creates vivid detail, giving you the feeling that you are stepping into the scenes of the book. But even more vivid than the details and action are the memorable characters that carry the story and keep the pages turning.