vote_for_palpatine said:

Big fan of the first game, just started the second game. Available for purchase at gog.com. I am an uncompensated endorser.

"First" game means some different things to Tex Murphy fans (much as it does to Star Wars fans).

Mean Streets was very first- my mom & dad knew some of the developers.
Martian Memorandum came next
then technology spiked, and...
Under a Killing Moon was sort of the "first" of the new generation.
Pandora Directive perfected the experience
and then
Overseer came along and retold the story from "Mean Streets", so you could consider this the first one.

When Pandora Directive came out, my best friend somehow managed to start playing my copy (at my own house!) before I could, so I dug up Mean Streets and started playing that for some reason. I got so into it that I finished Mean Streets before starting PD. I think that's a testament to the quality of a game when you can do that!

Recently, I made my wife play UAKM and PD with me. We were going to follow it up with Overseer, but somehow we got off track. :(