Bloody Passage - Jack Higgins - Bog

One man must fight to the death to save his sister from the Mafia's wrath
Oliver Grant is an American intelligence officer, a hero of the Vietnam War. But when the Mafia kidnaps his sister, his life is turned upside down and he agrees to complete a dangerous assignment for the powerful mob boss Dimitri Stavrou in order to gain her freedom: Grant must save Stavrou's son from a secret cliff-top prison in Libya. To accomplish this mission, he must scale the rocky crag and somehow get Stavrou's son out alive. His sister's life-and his own-hang in the balance.