This film begins with Jayne Mansfield rolling about in bed with money all over her. This seems to go on and on and on, as the only reason for the scene is to see this starlet in various states of undress. The film doesn't even pretend to be anything other than an exploitation film at the beginning--and it's obvious they only two things going for the film are hidden under Ms. Mansfield's towel.
This is the story, believe it or not, of "Mr. and Mrs. Smithopolous" staying in a resort in the Mediterranean. Of course these are aliases, as it's Mansfield and her boyfriend. While she rolls in the dough, her man is busy laughing like a hyena while he's killing off his partner in crime. It seems that they have just robbed a shipment of old US dollars that are being returned to the States to be burned and Mansfield's beau doesn't want to split it with his partner. Eventually, the three end up on a supposedly deserted island--which turns out to have several people waiting. There, they wait until the coast clears...and one by one, people in this group start dying off mysteriously.
The plot and action is VERY claustrophobic, as they spend almost all the film on this tiny island and this is bad because the actors are left trying to support the weight of the film. And, considering how bad the actors are, this is a chore they simply aren't up to. Cameron Mitchell basically spends the movie threatening and screaming while Ms. Mansfield does a great imitation of a brain-damaged bimbo (inexplicably, she claimed in real life to be a genius--this film will surely erase all doubts as to her intelligence or lack thereof).
A skimpy plot and lousy acting--it's pretty obvious that this is a grade-C project from start to finish. Why some of the reviewers here on IMDb scored this one so high is beyond me. Stupid and dull.