Battlestar Galactica: Betrayal is a fan fiction story writing by Allen Knott. It can be found here: Battlestar Galactica: Betrayal Volume One
Betrayal followed Natasi Ashia (Caprica - Six) as she bretray the Cylon's in order to prevented Operation Homecoming and save humanity.
The story start at the same point as does the miniseries with the destruction of the Armistice Station, one day before Operation Homecoming.
Betrayal include all canon characters, Dimension Eight and Dimension Five's characters also.