You have been sentenced to death and are being sent back to Earth on a space ship, locked in a cryo chamber. But once you wake up, you find the ship to be deserted.
And not only that - nefarious space pirates are looming on the horizon, and they have some nasty plans for the destruction of Earth. Better stop them!
Notes
According to Jasper Sharp, the author of the first Space Detective: "Just for the record, Space Detective 2 wasn't officially a Celerysoft title in that I had nothing to do with writing it or selling it. I remember the guy, Leslie Floyd, writing to me about whether it was ok for him to do a sequel, which I of course said yes to." [WoS]