In a sentence: An investment banker's secretary has her investment idea stolen by her boss, so she gets revenge by pretending she has her boss' job.
Plot: An ambitious Staten Island-raised secretary, Tess McGill (Melanie Griffith), is assigned to be the secretary for M&A banker Katherine Parker (Sigourney Weaver). Her new boss lets her share ideas. When Katherine breaks her leg on vacation in a ski accident, Tess is asked to look after things at her home and office. That's when she discovers that Katherine took one of her ideas and passed it off as her own. Tess uses it as an opportunity to pretend she has her boss' job. She then works with another banker, Jack Trainer (Harrison Ford), on her idea.
Genre: Romantic Comedy
Source: IMDb