Caught by Margaret Peterson Haddix
This is the fifth book in the Found series. The book starts with the 21st century’s time being frozen. Jonah and his sister Katherine are called upon again to go back in time to fix the time problems. This story features the lost child of Albert Einstein and his wife Mileva. It is 1903, before Einstein became famous, and Jonah and Katherine are trying to fix things they don’t understand. It also seems that Mileva is aware of their presence. Will they be found out and ruin the future? Will they ever get back to their own century? When will Jonah find out whose lost child he is? Get the series and start reading to find out!