Secret Service Agent Allie Gordon has one rule: Don’t get involved with the subject of an investigation. She broke that rule once and paid the price. When a US senator is threatened, Allie goes undercover to shadow the senator’s chief of staff—the FBI’s prime suspect. As the two grow closer, Allie’s only rule gets harder and harder to keep.

Nicole Lancaster has three rules: no blondes, no strings, and absolutely no second dates. Stress and scandals are easy enough to handle, but emotional attachments? Nope. When a compelling brunette shows up just as the threats escalate, Nicole begins to suspect not everyone is who they claim to be—including the woman who makes her want to break every rule.

When Nicole vanishes after an assassination attempt, Allie must uncover the truth—and her feelings—before it’s too late. But all the evidence points in one direction: Nicole orchestrated the whole thing. And her motive is simple—revenge.