What do you think of your fellow passengers on a bus, or a plane, or a suburban train?

Usually they are anonymous.

You might sometimes idly wonder about their lives outside the conveyance that briefly brings you into the same moving space, but rarely does it go beyond that.

But in this book it does go beyond that. A group of people, with their own lives and thoughts and histories are drawn together as passengers (and a driver) on a bus, and by the end of the book they have all interacted with each other, and their lives have all been changed in some way.

Some knew each other before they got on the bus: there is a family travelling on vacation, and two of the passengers were employees of the driver, but none knew all the others before they gathered for the bus trip, and before the journey ended they knew things about the others, and about themselves, that they had not known before.

There is little action, and no real plot. The book is a study of character and human interaction between people whose paths briefly, and apparently randomly crossed.