Jack Knife

London, 1888. The streets of Whitechapel are haunted by a killer. In the darkening shadows, he waits, and no woman is safe.
 
For Inspector Jonas Robb, each night brings a new victim, a new terror. It’s also brought two strangers—David Elliot and Sara Grant—who’ve arrived in London, seemingly with no past. What they do have is knowledge about the elusive Whitechapel fiend, including the name he calls himself: Jack the Ripper. Because David and Sara do have a past—it just happens to be in the future.
 
Sent back in time, they’re in pursuit of a 21st-century madman whose purpose is to change history. Already, they can see his sinister influence at work. As the body count rises, Sara and David realize that their quarry and Robb’s have become linked in a way that threatens not only Victorian London, but the very fabric of time. Joining forces, they must stop the carnage before it’s too late—for the past and future.