by Margaret Peterson Haddix
In this sequel to Found, the adventure picks up right where the last broke off, as two sort-of princes and Jonah and Katherine are falling through time back to the 14th century. Jonah and Katherine have to help Chip and Alex, or their historical counterparts, stay alive when Prince John is trying to kill them and steal the throne. Then, they still have to reset the messed-up past. Sound complicated? It is! But if you read both volumes, the author explains time travel in a really cool way and there's lots of adventure as the kids all try to stay alive.