Declan Baxter

A mercenary takes on the job of tracking down a target on a plane but must protect that target when they're surrounded by people trying to kill both of them.

SF comedy set after Earth has been invaded by a race of aliens, the Gu'un. A hapless human called Stewart is appointed the Gu'un's official liaison, is saddled with an alien housemate and must deliver their message to the masses.