Kangaroo isn't your typical spy. Sure, he has extensive agency training, access to bleeding-edge technology, and a ready supply of quips and retorts. But what sets him apart is the pocket: a portal that opens into an empty, seemingly infinite, parallel universe. Kangaroo is the only person in the world who can use the pocket, and he's pretty sure his agency only keeps him around to exploit this superpower for their own purposes.After he bungles yet another mission, Kangaroo gets sent away on a mandatory "vacation." While trying to make the most of his exile aboard an interplanetary cruise to Mars, two passengers are found dead, and Kangaroo risks blowing his cover to investigate. However, it turns out he's not the only spy on the ship—and he's just starting to realize that there is a massive conspiracy to unravel.