While in Las Vegas for a Mystery Book Convention, Jessica agrees to check on her agent's daughter who is currently working at a local casino while going to college. Upon arriving, Jessica soon gets caught up in a murder investigation when Susan's boyfriend, who was accused of skimming some money while working as a card dealer, becomes the prime suspect when his boss and another man are found dead. Suspecting that he's innocent, Jessica sets out to find the actual killer.

Jessica finds herself mired in a case of international espionage when she unknowingly acts as the go-between between spies and Russian Trade Ambassador Yuri Lementov, who tries to pass an encrypted note from his homeland to the U.S. government. When Lementov eventually ends up murdered, Jessica winds up in a tight situation especially when her friend and British spy, Michael Hagarty gets framed for the murder. She then has to team up with a Washington, DC police officer to prove his innocence and find the real killer before they escape.