The book that I am reading is the missing:caught by Margaret Peterson.what I have read so far was that Jonah gave mileva the elucidator because her future was gonna be really bad so he told her to use it to so that she won't have to experience it.As her husband Albert Einstein was dying decades later,she used the elucidator to travel through time and visit him before he died because she was supposed to have died years before him and she wanted to tell him that his theory about time traveling was correct.what I like best about my book so far was that they had a lot of challenges and obstacles but they still managed to figure out how to fix time and get back to their own time period.