The movie is set against the backdrop of the sea. A 6 member crew, whose leader recently committed suicide, is about to go to the sea to catch the fish and since they are short on strength, one member suggests taking Marcos, a fellow fisherman, with the team. With everyone in the crew still unable to cope with the demise of their leader, the fishing days become extremely intense. What all unfold during that time is what we see in Adithattu.