I have a big long detailed synopsis of the whole plot (and a bunch of ideas for a sequel, if we decide to continue it after this original story arc is complete in four years or so). However, it's not set in stone. So every once in awhile, if Jessica or I come up with a new idea or a change that we think makes the comic better, then we'll implement it. Then we read-through the synopsis with the change in mind and figure out all the trickle-down effects. So the story is mostly set, but it's malleable. The core components of the story has remained pretty static, however.