Straight-laced Savannah Blake's world is turned upside down when she finds her dad, Major Blake, shot on his lawn. Before he dies, he gives her a few clues to the identity of his killer. His dying request is "Protect your sisters." Montana and Asia are the only family Savannah has left, and she will fight to the end to save them. The pain of losing their father has Savannah obsessed with finding his killer.

Savannah suspects someone from "The Agency," a secret government security operation where her father once worked, is behind his death. She enlists the help of Troy Bridges, the owner of a private security firm in Dallas. She doesn't necessarily trust him, but Savannah needs Troy because of his inside knowledge of The Agency. The chemistry between Savannah and Troy is electric, and only intensifies as the stakes get higher. They have no time to deal with their unresolved feelings, though, because the closer they get to the killer, the more dangerous things become.