The Hollywood Informant

During the murder investigation of an undercover cop, two vice officers scramble to find the true identity of an elusive individual who's known only as 'the informant,' a killer, and possibly a cop, who tips off the mob to the whereabouts of the police during booze runs. The plot thickens when the vice officers stumble across a mysterious, seductive woman who claims to be a police mole, but who they believe could be 'the informant.