Set in the late 1970s in Barcelona, Marina tells the story of fifteen-year-old Óscar Drai, a boarding school student who spends his free time exploring abandoned mansions. During one of his wanderings, he meets the mysterious Marina and her father. Together, they are drawn into a dark and macabre mystery involving a long-forgotten scientist and a secret organization. The novel is a hauntingly beautiful tale that blends suspense, romance, and supernatural elements, which the author himself considered one of his most personal works.