When Alexis Castle is found murdered in Mallorca while on a holiday, Richard Castle is devastated and flies to the island, desperate for answers. NYPD, led by Beckett, soon discovers that Jerry Tyson-the notorious 3XK serial killer-had been hiding in Europe and may have orchestrated her death as revenge. Enter detectives Miranda Blake and Max Winter from The Mallorca Files. They were already investigating a string of similar murders across the island, all bearing 3XK's signature. At first, Miranda and Max are skeptical-why would a New York serial killer operate in Mallorca? But Castle's insistence forces them to dig deeper. As they uncover connections between Tyson. Beckett joins the investigation, leading to a high-stakes showdown in a secluded coastal villa. But the question remains-did Tyson kill Alexis himself, or is there a new apprentice carrying on his twisted legacy?
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