Here's a quick synopsis: Two years after the Spanish-American war ended in a zombie infestation that destroyed both armies, agents John and Jane Smith have been dispatched to the island to investigate some alarming reports. Traveling undercover, they take a cruise to the island and participate in a sight seeing tour to witness the zombies in their natural habitat, only to stumble upon a terrible revelation. Will they escape to warn the world? Or will the secret die with them on the slopes of San Juan Hill?
Here's the cover: