Although not listed among favourites of cinema critics, this work, filmed primarily in Hong Kong and Amsterdam, proves to be a very competently made affair, with good performances by such old hands as featured player Robert Mitchum and supporting actors Bradford Dillman, Richard Egan, and Keye Luke. Mitchum, as "Quinlan", a sullied former agent of the Drug Enforcement Agency, is hired by one of his erstwhile targeted criminals: Chung Wei (Luke), a leader of Amsterdam's major narcotics league, to discover who is murdering, on two continents, large scale heroin dealers. During the course of his investigation, Quinlan is re-hired by the DEA in return for supplying the agency, now under the aegis of his former boss "Odums" (Dillman), information concerning major supply locations serving Hong Kong's dope derby. As Quinlan attempts to assist both Chung Wei and the DEA, he discovers that sabotage of his operation stems from an unknown confederate, and he is made to realize that he remains less than popular with the drug enforcement administrators. The film is paced correctly by director Robert Clouse, who controls the many action scenes very well indeed, with his script spending exactly the proper amount of time filling gaps which might betray logic. It is a fair statement that dialogue is of above-average quality for an action production, with one remarkable monologue delivered by Mitchum in his character's Hong Kong hotel room as he propels the plot past a conundrum, a highly accomplished piece of acting. As there are no females in the cast other than extras, the complicated pickle in which Quinlan finds himself is not diluted by the normally obligatory romantic subplot, freeing an audience to concentrate upon a well-told scenario, incidentally marked by Dillman's strong performance and by the creative camerawork of Alan Humes.
