Eoin Colfer 
Forever Man (W.A.R.P. Book 3) 

You can’t outrun your own history . . .Still trapped in Victorian London, FBI agent Chevie Savano is determined to help her friend Riley find his long-lost brother. But the WARP wormhole has other ideas . . .Pulled two centuries into the past, Chevie and Riley find themselves in the village of Mandrake. Under siege from prowling monsters that have escaped from the wormhole, the village’s only protector is the sinister Witchfinder – a man with a hidden past and deadly powers.With Chevie branded a witch and sentenced to be burned at the stake, can Riley thwart the Witchfinder’s plans before he destroys them all?W.A.R.P. The Forever Man is the third book in the new time-travel adventure series from the bestselling author of Artemis Fowl.