Hank Griffin is a homicide detective in the Portland Police Department. He is Nick Burkhardt's partner and close friend. Like Nick, Hank is laid back and fair so they make excellent partners. He is a skilled detective and at first he didn't know about Nick being a Grimm. Nick kept it a secret. But he trust his long time partner. Later Nick let him in on his little secret about Grimms and Wesen and since then he got further involved in the supernatural world.