How the Multiverse Got Its Revenge

The concept of multiple interconnected worlds with their unique stakes is fascinating. I'm curious whether this idea came from classic sci-fi or a fresh twist from the author’s imagination.

The twists kept coming, but I wondered if the slower build in the beginning was necessary to set the stage or if it could have been tighter.

Some characters' loyalties shifted so naturally, but I’m curious about how much of that was planned versus evolved during writing.