Having more dimensions to play with makes finding what you're looking for even harder. Started in 1998, but perhaps fittingly not finished until 2004.
People have told me they don't understand this story. I suppose it would have been clearer if it had had another final panel showing that the coach had gone, vanished into the fourth dimension. But it's eight years old, which is well beyond the age at which I stop tinkering with a story.