Doctors Chase Durgin and Norah Bishop once had bright futures and an unshakable love. But when Chase bails in the aftermath of a devastating tragedy, she leaves Nora shattered and their relationship in ruins.

Now, a lethal new virus is spreading across the globe, and Chase and Norah are thrown back together on a special task force in a desperate fight to save lives. They have no time to face the ghosts of their past while they race against the clock to stop the spread. But the fire between them never truly burned out and keeping their distance is impossible.

When tragedy strikes again, can Chase be counted on to protect those she loves?