Books in the Grimm series

Features Portland homicide Detective Nick Burkhardt who discovers he is descended from an elite line of criminal profilers known as "Grimms", charged with keeping balance between humanity and the mythological creatures of the world.

Back in the 19th century a Wesen and a Grimm fight to the death. The Grimm wins, but the Wesen's son escapes and vows revenge. In the present day, Captain Renard sends Nick and Hank to investigate a crime cartel named Le Touche Givre (The Icy Touch), who are involved in forced prostitution and drug pushing