An American narcotics agent is sent to Amsterdam to take down an international heroin smuggling operation. His investigation leads him to discover a connection between the drug dealers and a secretive religious order. Action thriller based on Alistair MacLean's novel, starring Sven-Bertil Taube and Barbara Parkins.

Following a triple professional hit a U.S. agent, Paul Sherman, arrives in Amsterdam to investigate a heroin smuggling ring. He finds a city rife with drugs and a police force unable or unwilling to do much about it. With his incognito female fellow agent, Maggie, the American is soon stirring things up.