“Days of Cain”

J. R. Dunn

This is an unusual time travel book that I could barely put down. The idea of people assigned to insure that time travel doesn’t change history isn’t a new one, but here it’s given some interesting twists: the time crime perpetrator chooses to insert herself in Auschwitz and the time travel police, who are themselves from different eras, operate under the direction of evolved humans from millennia in the future.

The Auschwitz scenes are chilling and well-researched and the characters — particularly one Nazi guard — are interesting.