Mackenzie "Mouse" James's life is all about firefighting. Being a firefighter fills her waking hours, leaving her too tired to think, to socialize, or to put herself out there.

A large part of Sarah Macarthur's success as a doctor is due to the structure and control that that she has established to help her cope when all the elements are thrown her way.

As danger draws closer, Mac and Sarah will be tested in ways neither had ever imagined. Both will need to fight far more than fear­­-they will need to fight for lives.