When Olive Wallace offers to take several friends and relatives on a once-in-a-lifetime bus tour through post-WWII Europe, they all jump at the chance-even though Olive can be petty, demanding, and judgmental. But do they really care about seeing the wonders of Europe-the magnificent Roman temples and the majesty of Carcassonne, an ancient, fortified city in southern France-or are they just trying to stay in Olive's good graces?

Olive Wallace, after all, is extremely wealthy. And she is extremely outspoken about who she intends to leave her money to-or not leave it to-when she dies. Olive changes her will on a whim, and every person on the trip knows it.

On a bridge near Avignon, Olive is accidentally bumped into the river-or was she pushed? Days later, she is suspiciously nudged down the steps at the Nimes Colosseum. When Olive suffers a third accident in the narrow cobblestone streets of Carcassonne, she becomes convinced that somebody-one of her closest friends, perhaps-is out to murder her!