The Devil Wears Prada by Lauren Weisberger

This is quality chick lit, featuring a boss apparently modelled on the real-life Anna Wintour, editor of Vogue, whose all-round scariness and unapproachability can be guessed at from her nickname "Nuclear Wintour". It's funny at times and touching at others and has been made into a famous film. It's predictable in parts but still enjoyable.