Shell and Joe are tired of murder, so while exploring North Padre Island, when they find the body of a dog, who had been trying to dig something out of the sand, and they see the foot of a murdered woman, they are determined to stay out of it.
Succeeding in that (or did they?), a few days later they hear of an airline hijacking and Joe feels compelled to run to the rescue. Shell sticks by her man, and uses the resources of Rayburn Enterprises, which she inherited, to try to get the hostages released.
That's how they meet their third set of twins --two young men trying to save their father from execution for a ten-year-old murder. All motions and Appeals had failed.
With the aid of a half-Irish charter pilot willing to defy orders not to land at the site of the hijacked plane, they acquire unexpected help in the form of what Joe had always called The Other Me, and the three of them go on a cold case investigation to find the real murderer. It could cost one or all of them their lives.