Puppet on a Chain

The headquarters of a drug-smuggling cartel is the quarry of American narcotics agent Paul Sherman (Sven-Bartil Taube, Eagle Has Landed). Though the cartel's activities are centered in Amsterdam, Sherman's search for the headquarters leads to an island castle owned by an offbeat religious group. Sherman and his partner Maggie (Barbara Parkins, Valley Of The Dolls, Kremlin Letter) run into serious trouble when they try to gain access to the forbidden site. Paul escapes captivity and chases the culprits by boat in one of the most exciting boat chases ever filmed, a scene that has been compared to the car chase in Bullitt! (official distributor synopsis)