If only Marco hadn't read a newspaper article about a ranch and become determined to see one. If only Polo hadn't found himself longing for the mother he barely remembered as a soft-warm-wiggle-purr-milk-tongue. Then the two tabbies might have been content to remain pampered house cats forever. But when their owners leave a door open, Marco and Polo can't resist the temptation to escape to the outside world.

Their search for food and a dry place to sleep leads them to Texas Jake and the cats of the Club of Mysteries. Life on the streets is a lot easier with friends, but Marco and Polo have to prove themselves before they can become members of the club. And that means facing the huge mastiff Bertram the Bad, a pack of savage river rats, and a barren landscape that may be the ranch of Marco's dreams -- even if it seems more like a nightmare. Home is starting to look better and better...