Pete and Mac journey to Mexico to save an experiment in underwater habitation for its attractive young leader after she inherits the job from her father.

Pete plays goalkeeper and Mac masquerades as a trainer after a soccer team's star player is murdered. They hope to draw out the killer when Pete takes the place of the slain player.

Pete and Mac (Robert Wagner, Eddie Albert) try to learn who is using criminal tactics to drive an all-woman taxi company out of business.