Torn by Margaret Peterson Haddix
Second has caused a dangerous ripple in time, trapping Andrea and JB in 1600 and Jonah and Katherine in 1611. Jonah must pretend to be John Hudson because the real John is missing. Being John is very difficult for Jonah, especially since it is not his real identity. The crew on the Discovery-including his father- treat him harshly and somethings are not what they seem, but Jonah and Katherine know that they must persevere no matter what in order to save their friends-and all of time.
**Book 4 in The Missing**
Previous book: Sabotaged
Next book: Caught