While Heather remains quarantined with other survivors, she works with her FBI colleagues to identify the person behind this attack. The prime suspect? Dr. Chad Lawrence, an expert in his field . . . and Heather’s husband. The Lawrences’ marriage has been on the rocks since Chad announced his career took precedence over his wife and future family and moved out.

As more victims fall prey days after the initial outbreak, time’s running out to hunt down the killer, one who may be closer to the victims than anyone ever expected.