The Protector by Dee Henderson

Book 4 of The O'Malleys

Summary: 

An arsonist is at work. 

Firefighter Jack O'Malley is fearless when it comes to facing an inferno. But being a target doesn't sit well with him, especially when a serial arsonist is endangering his men. 

Civilians are being hurt. 

Cassie Ellis is a firefighter who has already been touched by the flames. She fears she's been sidelined for good. But faced with a house ablaze and fire engines too far away to make it in time, she's go no choice but to go in.

Cassie saw him. 

Cassie's partner, Ash, got her through the aftermath last time, but now Cassie has to decide if she can trust Jack as her backup. For she saw the arsonist, he saw her...and Cassie's afraid it's someone she knows.

And the final fire is coming. 

Jack is determined to help her laugh again. He never expected love to tie his heart in knows or Cassie's faith to change his life. The fires are escalating; now the arsonist is targeting Cassie. And Jack has become the protector of a woman he will risk everything to save...

Opening Lines: 

The electricity was out. The candle nightlight on the dresser was barely bright enough to scare away the ghosts. Jack watched the dancing shadows flicker on the wall and wished his mom had brought him the torch flashlight his dad used when they went camping. Dim was worse than dark, and the shadows were laughing at him.