Six astronauts. Two pets. One impostor ... On the state-of-the-art spaceship Gos, everything is carefully controlled by a crew of top-notch astronauts who each excel at their duties. That's why it's so puzzling when things start to go terribly wrong. Crew members are being attacked one by one, and it's clear the impostor won't stop until no one on the Gos is left standing. Can the crew find the culprit and put a stop to the impostor's nefarious plan--or is the mission doomed? This diary-style novel is the perfect book for boys and girls of all ages and reading levels -- especially those who love to play games!