In the secret room, look at the computer. Happily for us all, Rosa still has the memory stick from the Karth House (in an inside pocket where we couldn't see it, apparently). Click on the computer, and Rosa will copy a file named "clientlist.txt" onto her phone. Leave the room by going downscreen --
-- where Ray will demand the return of the memory stick. Surrender it happily; Rosa already copied the file onto her phone, remember?
You can now use that client list to get Jim to talk.