Seawitch
Alistair MacLean
 Lord Worth, ruthless and fabulously wealthy, has made a lot of enemies in the oil business. His new offshore oil rig in the Gulf of Mexico, named Seawitch, is one of the biggest in the world, and will put his competitors out of business. To destroy it and therefore be able to inflate the price of oil at will, the competitors get together and send one man to deal with Lord Worth. The villain has a personal score to settle with Worth and kidnaps him and his daughters. Fortunately for Lord Worth, his two daughters are betrothed to the protagonists, Mitchell and Roomer, two former police detectives/now private investigators. They set trying to save Worth and his daughters from certain death, as the villain intends to leave them on Seawitch when he destroys it with a stolen nuclear weapon.