The Hangman's Revolution : W.A.R.P - Book 2 (Airside edition)

FBI agent Chevie Savano is trapped in a nightmare future. Unless she can return to nineteenth-century London and change the course of history, millions will die. Luckily she has Riley the boy magician and a Victorian gangster with lovely hair to help her battle two crazed villains, who have brought the military technology of the future back in time - with potentially disastrous consequences. The stakes are higher than the hangman's noose and only Chevie can save the day.

Assuming she can avoid being killed by a couple of psycho warrior-nuns first . . . Warp is Eoin Colfer's thrilling, steam-punk, time-travel, adrenalin-fuelled adventure series.