A transport ship full of medical supplies has been stolen from a Hephaestan research centre at Nav Point #1, and is being carried now by a band of brigands to Bex, most likely to be sold on the black market. The drug is extremely addictive, so it needs to be destroyed.
It will be somewhere between Nav Point #1 and Nav Point #2. Identify the cargo in all shuttles along this route, and when you find one marked "Med Supplies: Hephaestus", blow it up. Many other cargo ships on this route are ours, so be careful not to blow up any innocent transporters.