When the venal “Spangler” (James Franciscus) teams up with millionaire “Shelby” (William Holden) to build a luxury resort on a island, he also sees an opportunity to engage oil prospector “Hank” (Paul Newman) to see if he can also guild their lily with a gusher or two. Believe it or not, they strike it lucky - but this experienced driller is concerned that the pressure readings are off the scale and that an adjacent volcano might soon be about to make it’s presence felt. To add the fourth wheel to the shopping trolley of a film, we have “Kay” (Jacqueline Bisset) who has previously had a…