Before Albert Einstein and Mileva Mari Maric were married, they had a child, a daughter named Liserl. She was left with Mari's parents and nothing more is known of her, her life, or her death. All that is known is that her parents didn't claim her after their marriage. This child has been the subject of books: non-fiction and fiction. Tim Powers has his own take on what happened to Liserl in Three Days to Never.

(Source: William Morrow & Company)