A Rip Through Time

 Fiction by Kelley Armstrong 

https://www.barnesandnoble.com

In this story, a Canadian police detective called Mallory is visiting Edinburgh when she almost gets murdered on 20 May 2019, next to a rip in time. This inexplicably catapults her back 150 years to the same day in 1869, into the body of a housemaid who also almost got murdered in the same spot.

Yeah, it's complicated, but just go with it.

As long as you accept the premise, this is a fun story with interesting characters. The author has a sequel scheduled for later this year as well, which I plan to read.