A romantic thriller is a narrative that involves elements of the romance and thriller genres. A good thriller provides entertainment by making viewers uncomfortable with moments of suspense, the heightened feeling of anxiety and fright. A thriller is more a familiar concept and description than a pure genre. It is not a genre with a precise definition. It can vary from comedy and melodrama to adventure and romance. All thrillers are a combination of different genres. The basic thriller trait of suspense fits with some genres better than with others. For example, crime, sci-fi and romance allow more scope for suspense than screwball comedies or musicals do.