I’ve written “two” sequel novels. The first sequel is science fiction — traveling to other planets Star Trek style. The second sequel deals with concepts like cloning and robots and holograms: things local to one planet.
The plan was to insert the characters from the Star Trek sequel in-between the new stuff, but that leaves me with a plot thread that cannot be resolved due to the new paths the affected characters (my protagonist and a female assassin) take. They don’t meet, and thus there is no climax. I can’t remove the assassin from the story because she is a big supporting character to other plot threads.
So I’m in a bind. Do I go back to the original timeline? I don’t know. I just don’t know.