No room for more players.
Previously: while investigating the abandoned lab in the basement you got some info of Adam's computer, as well as setting off the bioweapon trap, but managed to escape alive. You traded Slasher's corpse to the street doc for some truth serum you gave to Apple, who was not super forthcoming in the end. After learning that two members of the Scion of Death were on their way, you bailed from the doctor's office and holed up in an empty house somewhere in Rowville. You let apple go so that the Scion would not kill you, lived and then retired.
Now: You owe some people some favours and have some data to decode.