There are three things Jennifer 'Jinx' Sullivan promised herself she would never do:
1. Eat fast food.
2. Go on a coach trip.
3. Die without exacting revenge on the people who ruined her life.

She's about to let herself down on the first two, but she can still keep her word on the third. On a coach trip to Florence,

89-year-old Jinx is going to face her painful wartime history, unearth long-buried skeletons (quite literally) and plan long overdue vengeance on the worst best friend a woman ever had. That's the best friend who trained her in etiquette, cocktail-mixing and silent killing.

It's going to be a tough journey - not least because she's sharing it with twenty senior citizens and a recalcitrant teen. But Jinx knows that some promises are worth keeping, no matter how hard it may be.