Hi, Xavier is still in this right? I played through to the end and didn't hear from anyone in the tower about an intruder... I hope to find him again because he's yet another character that I have come to adore...
He is! Hrm, could be a bug. You should see that storyline once you build the bank. After the initial meeting, you need to build a security office to progress to trying to catch him. Let me know if you have both of those and you still haven't seen him!