I was disappointed by the stereotypical'' the-butler-did-it ending.
lacking spontaneity or originality or individuality; "stereotyped phrases of condolence"; "even his profanity was unimaginative"
A stereotypical idea of a type of person or thing is a fixed general idea that a lot of people have about it, that may be false in many cases. Dara challenges our stereotypical ideas about gender and femininity