Usual disclaimer: None of the characters you recognise are mine, most of them belong to the guys that make Highlander, except for Richie who is hiding out with the Clan Denial.
This story, and indeed most all of my Highlander fanfic, takes stuff AC has written as canon. This one is partly based on "The Gift". You'll know more about what happens if you read that, but if you don't you find out along with Viv, so that should be okay.