Start by talking to Gordon Bower, who'll be at Salamanca Uni. Do his missions and he'll introduce you to Skipper LeGrange, who in turn will introduce you to Kelly Nemmers.
Kelly Nemmers will eventually point you to Buck Salinger, who will, after you finish his missions, introduce you to Katie Hannon herself. 
Sam: "My mind is a swirling miasma of scintillating thoughts and turgid ideas."
Max: "Me too."
Stuff
Every time I have done KHTF I have had to rely on someone else having the contact as I didnt do Kelly Nemmers arc 
Golden-Phoenix - Lvl 50 Fire/Fire Tank
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How much wood would a woodchuck chuck if a woodchuck could Chuck Norris?
there is always the Oroboros Back tracking to unlock Katie Hannon.
Is not going to remain VIP after Jan 14th 2012, but may remain an active Premium account holder.
See some of you guys/gals in other/new MMOs Soon(tm)
N.B. If you are going to do smt, please do it or GTFO and STFU nab
Buck Salinger's arc is the one you need to do to get the introduction but it's never an actual introduction. You just need to complete his missions (including the humdinger that is his last one - get a good team of 5 is my recommendation).
If you're over 30, you should get an introduction to Kelly Nemmers, the contact before him from Gordon Bower.
Good luck with it, they're some of the most annoying arcs in game thanks to the rabid, knife-wielding pixies. 
@Dante EU - Union Roleplayer and Altisis Victim
The Militia: Union RP Supergroup - www.themilitia.org.uk
Thanks all I've done the Croatoa arcs with other alts but didn't realise you needed to do Bucks to open Katie.
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Buck Salinger's arc is the one you need to do to get the introduction but it's never an actual introduction. You just need to complete his missions (including the humdinger that is his last one - get a good team of 5 is my recommendation).
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When the ambushes start coming at the end of the last mission, I kill all but one who is kept alive but held/taunted and I go watch some TV for 15 minutes or so...
Octavian Vanguard
@ohmsEU and @ohms 2
Badging character: Bimble on the Union server, Badgehunter.com and City Info Tracker.
Tried to do the Katie Hannon TF last night, but she wouldn't talk to me. She said something about talking to her sisters before she'd trust me.
I'm guessing I need to do 1 or more of the Croatoa arcs before she'll talk to me. Does anyone know which arc(s)?