Firewall scanners have detected an unusual spike in chatter in Solarian space. The team is to ego cast into Hooverman-Geischecker posing as a group of Argonauts. The group they are replacing is not in on the conspiracy, just simply easily bribed with a hedonistic trip to Pavarti. The sentinels were selected because their skill set somewhat matches that of the Argonauts. They will have to maintain the ruse while on Hooverman.
The investigation into the cause of the increases communications will lead the players to a murder mystery. Someone is hunting the surya. A good source of information turns out to be the successor to Greenpeace, Voidpeace.
If the players are generally uninterested in social skill checks, you can simple jump to the conclusion that someone is killing the space whales. The key point of the plot is the question of why.
Eventually the sentinels will be pointed toward Aten and the rumors of weaponized exsurgent virus. Another line of inquiry will lead to a stealthed ship as the means of performing the killings. This alone is a worthy trophy as its stealth characteristics imply alien and/or TITAN tech. Firewall will want to acquire this technology or destroy it in order to maintain the balance of power.
Having eliminated the immediate threat, or not, the team still has a few threats. Who and how has been established. The why is indeed connected to an exsurgent virus strain. But from where? Why are leads starting to point to the Exoplanet Babylon? Is there a connection to the Babylon Rascal? Are the well meaning Voidpeace now a disease vector? How does the exsurgent virus remain viable in a stellar corona? Serious implications for standard procedure of cleanse with fire if the heat of the sun is insufficient.
Also did they team flub their impersonation? The team should be given an opportunity to make it right before the cleaners are brought to reset everyone to a backup prior to the teams arrival.
To fill in some of the blanks:
EvilCorp has determined that something of value is hidden on Babylon, and similarly concluded that it is the Rascal which is responsible for shooting up the place now and then. Determined to find a way to neutralize the Rascal, so as to secure the secrets of Babylon for the,selves, EvilCorp began looking into exsurgent virus strains that maintained virulence in a stellar corona. The murdered surya were killed before their symptoms could be noticed.