Mel and Bill go on the case to bust up an international spy ring.

With Bill set to testify as a key witness in an important government trial, Mel discovers a time bomb in their apartment and sets out to find his partner—who is tinkering in the garage.

The Bureau hatches a scheme for Mel and Bill to infiltrate the apartment of an actress who holds a list of high-ranking espionage agents.

Mel is thrown from Bill’s car during an accident, which forces the pint-sized special agent to avoid the pitfalls of both man and beast in order to stay alive.