What was the STS-135 Mission of the Space Shuttle Atlantis? To find the answer, follow the adventures of two cats, or catronauts, as they work aboard the International Space Station. The fearless felines' final flight is full of fun and frolic, and follows the actual activities of the astronauts of the Atlantis. The story ends with the last landing and final wheels stop of the shuttle program. Read how the adventure began. In The Last Launch: Liftoff, Book 1, two curious kittens watched a shuttle launch, learned about space missions, and fulfilled their dream to become astronauts. Book 1 ends with the last launch of the shuttle program.