Yes. Goodbye Gemini is based on the novel Ask Agamemnon by Jenni Hall. The movie's primary divergence from its source material is that it presents the story in chronological order. The book begins with Jacki wandering the streets of London in shock and being discovered by James, who takes her back to his flat. This provides the frame narrative, as Jacki progressively recovers and puts together the events that led to her wandering London.
The book was also highly experimental in style. In addition to the frame narrative, there are segments of the book where Jacki enters a fantasy realm inside of her own mind where Agamenon the teddy bear is alive, and assisted by a "servant" named Arcas, who is never described. These segments are written in the format of a Greek tragedy and occur in the middle of prose segments in the book.
