Whether Orion ought to be feet- or head-up in the night sky depends on the hemisphere. When Stan, a 23-year-old student from South Australia, rides his bike through the Rocky Mountains, he marvels that the constellation is upside down.

The assignment: Craft a novel from the literary equivalent of found objects. Consider the narrative possibilities contained not just in letters and e-mails, but in school report cards, emergency room bills and police reports filed by night managers at Westin Hotels.

In “Went to London, Took the Dog,” Nina Stibbe, author of “Love, Nina,” delivers a funny-sad portrait of midlife.