Half a million dollars is stolen from the mafia by small-time crook Harry Mitchell, who splits it with girlfriend Stacey Woodward and takes off for Acapulco.
The mob sends hitman Dano Villanova to deal with Harry and get the money back. Sol Madrid, an undercover narc, is out to find Harry first, hoping to persuade him to testify against organized crime in court.
Stacey happens to be Villanova's former girlfriend. Things get complicated in Mexico, where a heroin dealer named Dietrich is engaged in criminal activity while Mexican law official Jalisco is on the case. Before she can flee on a yacht, Stacey is taken captive by Villanova and shot up with dope until she becomes an addict.
Harry is caught and killed. Jalisco is not what he seems to be, so Madrid not only must deal with him, but with Villanova and Dietrich as well.
The film score was composed by Lalo Schifrin and the soundtrack album was released on the MGM label in 1968.[3] An expanded edition of the soundtrack was released on by Film Score Monthly in 2010 as part of the five CD box setThe Cincinnati Kid: Lalo Schifrin Film Scores Vol. 1 (1964-1968).[4]