The Hangmans Revolution
            
                Warp
FBI agent Chevie Savano escapes into the past to elude the secret police after they kill Charles Smart just as he is telling her of the WARP program, and she and Riley team up to find Colonel Clayton Box before he can launch missles at the capitals of Europe.
Young adult fiction, Juvenile fiction, Fiction, Science fiction, Assassins
Eoin Colfer
Eoin Colfer (pronounced "Owen") is an Irish author of children's books. He worked as a primary school teacher before he became a full-time writer. He is best known for being the author of the Artemis Fowl series.

([source][1])


  [1]: https://en.wikipedia.org/wiki/Eoin_Colfer