FIRST, DO NO HARM Dr. Calista St. James had been bound to that oath in her work for the Global Crisis Alliance. In the world's most dangerous countries, she had healed the needy and defied the ruthless mercenaries who'd tried to stop her. Then she'd been dishonorably dismissed after a tragedy that haunted her still. Now the Alliance wanted her back—and they had information to ensure her cooperation. The lover she'd believed dead was alive, a prisoner in a militant-controlled territory in Russia. But secrets lay deep in the Russian wilderness. And Calista had to expose the truth at the risk of everything—again.

Working in war zones while treating the sick and wounded, Dr. Calista St. James was used to being under siege. But now, her team had been deliberately infected with a dangerous virus—and all signs pointed to it being an inside job. Before Calista could expose the traitor, she had to travel worlds away with black-ops agent Damian De Luna—a man she didn't trust—to find the cure. Radical steps were needed to stop this deadly outbreak—but could Calista stop the breakdown of everything she'd dedicated her life to fighting for?