Flesh Pit (2004)

When a woman suspects her husband of cheating, she hires a detective to search for evidence. The husband learns of this and arranges for the detective to find nothing. However, when the detective does not believe in this husband's feigned innocence he digs deeper and discovers the terrible secrets of illegal drugs, psychotic violence, illicit sex, and white slavery. The detective is then himself compromised in the death of the wife.