Released here in Australia under the more 'spiritual' title "Fixing the Shadow", this film, based on a true story, deals with an undercover cop (Sheen) who verges on the suicidal. His pain stems from the confrontation he had with his cop-step-father who abused him as a child.
Sheen, encountering an Apache, learns the tale of someone who 'lost their shadow.' Thus, as Sheen goes undercover, he must confront his fears in order to be restored whole.
You can bear this in mind, otherwise this would just be another biker film.