Spain, 1982. Andrés Expósito, a young police inspector, accepts a posting in Denia, a small town on the Mediterranean coast, in the hope of leading a quieter life and that the natural environment will help improve the fragile health of his daughter; but once in his new post he becomes involved by chance in the investigation of the strange death of the inspector he has come to replace.
Ten-year-old Nico receives a threatening letter and now his life is in danger. No one seems to believe him except one person that he doesn't know.