The Forever Man
Riley, an orphan boy living in Victorian London, who has achieved his dream of becoming a renowned magician, and Chevie, the seventeen-year-old FBI agent who traveled from the future and helped him defeat his murderous master, Albert Garrick, face the return of Garrick, an assassin-for-hire, and must destroy him once and for all.
Science fiction, Assassins, Orphans, History, Time travel
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