It's the late 1950s. Ches Markham is an FBI agent stationed in D.C. who is known as a lady's man...and who uses those skills for Uncle Sam. He's set-up to be seduced, and snatched, by Dayne Holcombe, a beautiful Austrian seductress, as part of an elaborate scheme by Nazi fugitives involving stolen gold and diamonds. But it all goes violently wrong for everyone. Markham escapes and Dayne flees to Sierra Negro, a volcanic island off the Yucatan peninsula...