Burke is in Mexico City to try and learn who is behind an assassination attempt against Pablo Vasquez, the Mexican Government's Labor Leader, who very pro-U.S. He discovers that a proposed peace treaty is the reason behind the attempt on Vasquez while he was watching the renowned female matador, La Tigra. Burke gets himself thrown in jail in order to question a suspected conspirator, but learns nothing. La Tigra distracts Burke while he is guarding Vasquez and Vasquez is kidnapped. Failing to kill Burke, La Tigra confesses that she was only in on the plot because she was being blackmailed by the leader of the plot, Darvas. Together, Burke and La Tigra rush to her ranch where Vasquez is being held captive by Darvas.

Union Seecorps, a fanatical revolutionary group led by Harrison Quentin Filmore, has a dream. Filmore wants to bring peace to the world through Operation Euphoria. He plans to to dose Washington, D.C., with LSD gas for three days. First they must steal H09, a gasoline additive, from Narvoo Air Base, in order to drug the troops. Burke is sent to the base and poses as a member of the military police in order to guard the additive. Filmore, however, manages to drug the entire base and steal the additive. Other members of the Union plan to take advantage of Filmore's ""high"" ideas of peace and take over the United States Government. Burke now has to pose as a traitor in order to infiltrate the Union. He does, but Filmore decides to test his ""disloyalty"" by ordering him to kill a CIA agent.