Puppet on a Chain

After three professional murders, a U.S. agent goes to Amsterdam to probe a heroin ring. He discovers widespread drugs and ineffective police. With his undercover female partner, he begins shaking things up.

Puppet on a Chain is a 1971 crime thriller movie directed by Geoffrey Reeve, starring Patrick Allen, Alexander Knox, Barbara Parkins. It holds an IMDb rating of 6.0/10 from 1,494 votes and runs 1h 38m.