Definition of a thriller

The Wikipedia page for 'Thriller (genre)' states that "thrillers are a genre of literature, film, and television programming that uses suspense, tension, and excitement as the main elements." Clearly these are all elements that we need to include in our opening. I am hoping that the lack of direct information given to the audience will incite tension and suspense whilst the idea of an assassination about to take place and the cold opening of the black screen with muffled screams will provide excitement whilst adding to the suspense and tension.