The series "Hierro" is a Franco-Spanish crime detective story about a mysterious murder of a young boy on the Canary Islands. Young judge Candela is transferred to work on the most remote island of the archipelago - El Hierro. After an earthquake, the body of a local boy is found. It turns out that the next day he was supposed to marry the daughter of the scandalous entrepreneur Diaz. The would-be father-in-law becomes the main suspect. Now he and Candela share a common goal - to find the true killer.