jonah and katherine come face to face with albert einstein in the fifth book of the new york times bestselling the missing seriesjonah and katherine are accustomed to traveling through time but when learn they next have to return albert einsteins daughter to history they think its a joketheyve only heard of his sons but it turns out that albert einstein really did have a daughter lieserl whose 1902 birth and subsequent disappearance was shrouded in mystery lieserl was presumed to have died of scarlet fever as an infant but when jonah and katherine return to the early 1900s to fix history one of lieserls parents seems to understand entirely too much about time travel and what jonah and katherine are doing its not lieserls father eitherits her mother mileva and mileva has no intention of letting her daughter disappear