An elusive maniac kills the inhabitants of Vitoria, decorating their bodies with eguskilors – Basque ritual symbols. Just like 20 years ago... But the man accused of long-standing crimes has spent all these years behind bars and is just getting ready to be released. Did the criminal have a copycat, or did the court put an innocent man behind bars? Inspector Unai Lopez de Ayala, nicknamed the Kraken, is taking over the investigation. He doesn't know anything about the killer yet. But the killer, who leaves him mysterious and very personal messages, knows everything about the Kraken…