Seawitch (published in 1977) - Author - Alistair Maclean - action related to a massive oil platform

Alistair MacLean is a Scottish writer who specialized in writing thrillers and crime stories. He was third son of a Scottish minister and joined the Royal Navy during the world war two. He was a senior torpedo operator at the height of his career. He was in the thick of the war theater during the world war and saw action on many fronts especially the arctic north. After retiring he started penning his novels based on the war he saw and many of them became best sellers. Maclean never looked back as a writer until his death in 1987.
Seawitch is the story of a rich ruthless oil magnate who can pull all stops to make profit. Lord Worth is a very rich businessman whose main interests are in oil. This tycoon builds the largest oil rig off the waters of Houston and has invented some special type of equipments to enable his company to drill maximum quantity of oil at his will and fancies.
So the other oil tycoons get the jitters as the price of oil starts to slide. So what do they do? Well the easy way out, hire a killer to stop Lord Worth in his path. The competitors are an inhuman bunch as they don't care how the mission is accomplished and are ready to pay the highest price to stop Worth.



The hired killer, John Cronkite has a major ax to grind against Lord Worth as he has been the root cause of many of his miseries. So Cronkite talks to the Russian, Cuban and another communist renegades top source for the weapons to destroy Seawitch. But Lord Worth gets the whiff of his plans as one of the conspirators is a spy. He hires detectives to defend Seawitch at any cost.
In the mean time, Lord Worth's two daughters are kidnapped from his villa and are held prisoner on the Seawitch. To make matters worth the Russian and some Cuban submarines are making their way to destroy the oil platform. Lord Worth approaches the Ministry of Defense to scare the submarines and succeeds. But Cronkite has managed to steal some nuclear weapons and reached the Seawitch.
Does Lord Worth succumb to pressure? No way, he has got aces up his sleeve in detectives Mitchell and Roomer who are in love with his two daughters, Marina and Melinda. These are ex-policemen who are the typical cynical, rough and tough MacLean heroes. They are brutally honest and totally in love and will go to any lengths to rescue their damsels in distress. So the match is set and the fight is to begin.
Lord Worth who reaches the rig is also imprisoned and Cronkite and his men booby traps the entire oil platform. Mitchell and roomer arrive with a doctor as a scientist. They try to take over when Cronkite's back is turned and Roomer gets hurt. He leaves to get more relief as Mitchell mans the platform. But Cronkite will not go so easily. He takes over Seawitch again and this time places the nuclear weapons. Soon high adrenaline shooting game commences where Mitchell kills four of Cronkite's men. Lord Worth, his daughters and the good men leave stealthily and watches the oil rig explode with Cronkite and his men on board.
Seawitch was written during the fag end of MacLean's writing career and you can feel him loosing touch. I feel you can buy it as a one time read and forget it.