The head of an undercover narcotics division assigns a young policeman, Dan Shay, to infiltrate a high-school drug ring.

Shay poses as a hot-rod enthusiast to infiltrate a gang of supermarket thieves.

Posing as a college student, Shay infiltrates a baby-selling ring.

Shay infiltrates a violent gang of motorcycle thieves.

Shay poses as a drifter to track down the killer of two prostitutes.

Posing as a patient, Shay makes an office call on a crooked doctor.

Shay becomes a produce truck driver to nab an organized-crime arsonist and the Mob's top man.

Working with a federal agent, Shay poses as a weapons buyer to make a case against an arms dealer.

Shay poses as a junkie and uses a drug abuser to track down a robber.