Marco and Polo might have been content to stay house cats forever. But Marco has read all about ranches and decides he must find one, while Polo longs to find the mother he barely remembers. And then Mr. Neal leaves the side door open by mistake! Now, after their Grand Escape to the outside world, their lives are full of challenges and opportunities they never imagined. Their search for food and a dry place to sleep leads them to Texas Jake, the ornery cat-leader of the Club of Mysteries. With the help of Carlotta, a friendly and resourceful she-cat, Marco and Polo try to earn admission into the club. Before they can join, however, they must solve three dangerous mysteries. Facing Bertram the Bad (every cat's nightmare) is only the beginning....