Readers around the world have fallen in love with the Senior League-Martha, The Genius, The Rake, Christina and Anna-Greta-the five Diamond House retirement home residents who turn to a life of crime.
New owners have taken over the Diamond, making cost-cutting changes that transform the happy home into a dull and dreary place. The residents wonder if they wouldn't be better off in prison! Martha gets an idea: they shall commit a crime that will ensure conviction-some type of financial crime, a small coup of some sort-and give whatever they get to the poor and elderly. If Robin Hood could do it, so can they!
What starts as an attempted robbery of a nearby luxury hotel escalates to art theft from a major museum, the culprits armed only with bolt cutters and high-tech walkers. The Mafia gets wind of these robberies, and suddenly the underworld has its eye on the stolen paintings and the handiwork of The Genius. Soon the Senior League has both the law and the lawless on their heels.