ix years ago that resulted in a traumatic brain injury, Olivia Callahan is now a private investigator with her own firm. The assault that almost took her life resulted in a spectacular metamorphosis. No longer the shy, passive introvert she once was, she's become a driving and determined force. However, the lack of impulse control caused by her rewired brain causes her to run toward trouble instead of away from it.

When Olivia sends her colleague, Sherry, to the Florida panhandle to find a missing friend, Hannah; the search takes Sherry into the dark heart of an abusive, hostage situation. The man Hannah married is cruel, dangerous, and well-connected. Olivia reels in her favorite cop-Sergeant Hunter Faraday-for a discreet assist, and it soon becomes clear that Hannah's new husband is adept at waging war against anything that blocks his way.

While rescuing Hannah is Olivia's primary goal, her incarcerated ex-husband has other plans. He's collected friends who support his obsessive need to punish her for her role in his murder conviction, and a time bomb is ticking.

As Olivia and Sherry battle to save Hannah, try to neutralize the fiendish plan of an ex bent on revenge, and endure a terrifying race for their lives through the Florida wetlands, a final betrayal waits patiently in the dark. Smiling.