There is a very interesting update on multiple universes in today's Telegraph, from the U.K., in an article by Roger Highfield. He seems to think that multiverses are a done deal. Give it a read and see what you think!
In my novel, Gettysburg Passage, I flirt with the possibility of a parallel universe but do not make it central to the plot, which could involve some kind of time travel. How certain events unfold is left to the imagination of the reader. But I must admit the possibility of multiverses is really cool and the idea that you could jump between them, maybe to a more desirable outcome, is attractive to many.
Gettysburg Passage is a fantasy novel from Amazon which takes place mostly in the present time. But several of the main characters do get sucked into past events in American history, if only for brief slices of time. The challenge they face is, are they willing to give up the very comfortable present to make a great contribution to history and civilization that is occurring in some other time or parallel existence? If they elect to help out, they probably won't make it back "home." Would you do it -- make the jump -- if your reality would become far more exciting somewhere else?
Go to Amazon.com to learn more about Gettysburg Passage, just $2.99!