A Game of Masquerade by Shani Cossins

Everyone has heard of Jack the Ripper the Whitechapel serial killer whose identity remains a mystery to this day.
But what if there is more to this mystery than meets the eye? What if the identity of the murderer is more than
human? A fugitive from another world who joins forces with Scotland Yard is soon to discover that past and future
events have created a monster, which ignites fear and outrage on the streets of the East End.
To stop the murderous rampage in 1888, Professor Orlando Delbrotman must solve one of the most brutal mysteries of the 19th century…without changing history…