Guns of freedom

American adventurer Cain Ruby is hired by commercial interests in New Orleans to assist in General Lopez's invasion of the island. His immediate task is to infiltrate the Spanish defences, meet with the Cuban freedom fighters, and blow up Montana Sangre, the infamous Spanish prison. His secondary objective is to locate Annette DuRique, the daughter of a New Orleans merchant, who was visiting Cuba at the time of the Spanish embargo. But when he arrives in Cuba, Ruby finds that nothing is quite what he expected.