Tom Clancy's Net Force: Breaking Point, Steve Perry (2000)
Don't remember it much except the personal lives of all involved move forward. A little research tells me this one had something to do with Extremely Low Frequency (ELF) driving people mad.
This was the book that got me wondering -- not that it was going to stop me from reading the next two -- if this ragtag team was ever actually going to be successful at something. Oh, sure, things get resolved but no one is going to confuse these books with real life operations at the FBI, not even those ten years in the future (which is almost now). So if the evil scientist geniuses can make quantum computers and manipulate radio waves to control minds, why do these technologies always get lost forever and how come, with all these evil scientist geniuses running around, none can duplicate the results? And how dumb are the folks who run Net Force if they can't recruit some of these geniuses who always seem to outshine their geniuses?
It's science fiction, whether they want to admit it or not. So if they want to establish that the FBI's Net Force suddenly have super-duper super computers, what's the problem? They're trying to keep it realistic?