Nina Kiriki Hoffman & Kristine Kathryn Rusch 
Echoes [EPUB ebook] 

Captain Janeway and her crew work to save billions of innocent lives in this white-knuckled Star Trek: Voyager novel.The U.S.S. Voyager finds itself in a system where a planet might have existedbut doesn’t. Where the planet should have been, millions and then billions of people are appearing from nowhere and dying in the vacuum of space. To solve the mystery and save billions of lives, Captain Kathryn Janeway will have to face multiple, alternate versions of herself and the crew of Voyager. Janeway will have to find a way to work with her alternate selves, with whom she shares much but each of whom has a different agenda. At stake is the survival of Voyager and the lives of billions of innocent people.