The fourth installment in the legendary Matt Helm thrillers.

Matt Helm, code name Eric, is sent to extract a female agent working as a stripper in a bar in Mexico. When she is killed before Helm can complete his mission, he finds himself teamed up with the woman's sister as he fights to save the lives of a group of scientists and American officials.

Originally released in the era of the James Bond novels, the Matt Helm novels were considered grittier and more realistic than Bond, garnering them critical praise and an ardent audience.