Caught is the 5th book in the Missing Series. It was released in the US and Canada on September 4, 2012.
The twenty-first century was supposed to stay safe, Jonah thought. Wasn't it? Jonah and Katherine are sitting in class when time freezes. Everyone, everywhere, in the twenty-first century is frozen in time-EXCEPT for time travelers everywhere, like Jonah, Katherine and Chip. Something is catastrophically wrong, but what? How can they fix it? Jonah and Katherine barely have a second to talk to JB before they find themselves hurtling back in time again. They end up in 1903, where a botched job of returning Albert Einstein's secret daughter, Liserl, has somehow critically damaged time itself. Jonah and Katherine have their work cut out for them, working to set right a problem they can't understand. And there's another wrinkle in their plans: even though the Elucidator has made them invisible, it didn't make itself invisible and Mileva Einstein (Einstein's wife) seems to have caught it and is very determined that Jonah and Katherine are out to get her daughter. Will they make it out? Will they save time?