The Harts look forward to a nice lunch with Jennifer's friend and her new husband, but her husband suddenly disappears and is shortly found dead. Meanwhile, two men who followed him out of the restaurant next show up in his L.A. apartment and start following who they think is his wife: Jennifer.
An Egyptologist is killed just before the opening of a stagey exhibit, featuring the mummy of an ancient Egyptian prince who legend says is waiting for his princess to join him in death -- and she looks just like Jennifer.
Jonathan and Jennifer are in Hawaii for a croquet tournament when a tournament official is stabbed, and the Harts wind up in an international dilemma involving the KGB, MI-6, the CIA, and a fancy key that may unlock deadly secrets.
The Harts want to give their charity committee gourmet chocolate hearts as a thank-you, but when one turns out to have been part of a smuggling operation, can Jonathan and Jennifer figure out what is going on before someone tries the "special" chocolates from an unknown admirer?
Max's bodybuilder protégé Vince is about to open a gym, but someone tries to steal Vince's famous barbells - twice. They leave Max injured the first time and a Scotland Yard inspector dead the second time, muttering the name Noel Teppman, an almost-mythical gold thief. Jonathan realizes Vince has been pumping not iron but gold and sets a trap for Teppman.
After two attempts on Jonathan's life, he stages his own murder to see why someone is trying to get him out of the way. A stranger who once helped Jonathan out of a snowdrift turns up with a will supposedly leaving everything to him, and Jonathan's lawyer Owen starts putting the moves on Jennifer.