In the Dark of Night — R. Barri Flowers

Modern day criminologist R. Barri Flowers' In The Dark Of Night is a heart-pounding historical thriller about the infamous serial killer, Jack the Ripper.
In 1888 in New York City, the search for a killer of prostitutes comes to an end with the capture of Doctor Jack Lewiston, a respected surgeon and a madman. But before he can go to trial, Jack escapes from custody and flees the country to London, England.
Brought out of retirement to track him down is ex-NYC homicide detective-criminologist, Henry Marboro. In charge of the original investigation in the "Ripper Murders," Henry lost his objectivity when his younger sister was one of Jack's victims. Ultimately his obsession to find the killer costs him just about everything dear to him.
Now Henry must find Jack Lewiston and bring him back to America-dead or alive-before more prostitutes become the victims of the multiple sexual murderer.
In the process, Henry develops an attraction for a mysterious and beautiful American nurse, Loraine Broderick, who is living in London. Unfortunately, Jack also sets his sights on her as a target of his madness-in addition to the streetwalkers in London's East End.