In “Costiera” an Italian-American former marine named Daniel De Luca is a problem-solver in one of the most exclusive hotels of the world in Positano, a gem resort between Sorrento and Amalfi. He is a guest of the owner because DD, as everyone knows him, is the only person who caught a glimpse of the face of the man who may have kidnapped his daughter and therefore the only person who may be able to hunt the kidnapper down.