" the fifth book was one of the best in my opinion. Haddix keeps the same characters but adds a few more, such as the younger Albert Einstein and his wife, Mileva. Along there journey to 1903, Jonah and Katherine discover the shocking truth to the mysterious woman who was left behind in Einstein's shadow, leaving everyone, including JB reconsidering their fate. "
— 6brown_danielle, 1/23/2014