This is a second idea that I developed while sitting on the train heading home from work one night. As always, all readers are free to use / improve or embellish this idea as much as they like, as long as it inspires people.
Imperial Hope
Quick synopsis: Rogue Merceneries have captured an Imperium frieghter. With only 30 minutes until the mercs can jump away the imperium has contacted local merc fleets to attempt to reclaim the frieghter.