Polohas always longed to find his mother. All he remembers is that she was soft and warm and smelled of milk. So when sassy, street-smart Geraldine returns, she isn't exactly the mother he expected. But Polo is still thrilled to have found her and is eager to show her off to his pack of friends in the Club of Mysteries.
As usual, there are many mysteries to be solved. Does the light inside a refrigerator turn off when the door is shut? What is at the top of a church steeple, anyway? But perhaps the most puzzling mystery of all is one Polo cannot figure out: Does his mother truly love...

It's a scary world out there.
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...