From the back cover:
You are an Interplanetary Spy. Your mission is to fly the experimental X-wing starship to the planet of Doorna. Monsters have taken over the planet and you must restore peace!
A mysterious distress message has been received by Spy Center from the outpost world of Doorna and the reader is sent to this distant planet to save the natives from invading monsters.
available under the CC-BY-SA License.