Blast off with Christina and Grant as they try to solve a mystery bigger than the state of Texas! On a trip with Mimi and Papa to Space Center Houston, the kids learn that a valuable moon rock has been stolen! Houston, we have a problem. Could a cowboy be involved? How about an astronaut? With help from a couple of new friends, they learn the history of the space program, fire a rocket, take a wild ride on a moon rover, and learn how astronauts go to the bathroom! (Very carefully!) But will they find the moon rock in time? Buckle your seat belts - this mystery is out of the world!