They are accused of 'plotting' the assassination of the prime minister. = They are accused of 'plotting' to assassinate the prime minister.
As the 'plot' unfolds [=as the story continues; as things happen in the novel, movie, etc.], we learn more about the hero's family.
He is a master of 'plot' [=he is very good at thinking of interesting stories], but his characters are not realistic.
(..) Boom! guilty of masterminding the savage attacks that have plagued Zootopia of late. Her predecessor, Leodore Lionheart, denies any knowledge of her plot, claiming he was just trying to protect the city. Did I falsely imprison those animals? Well, yes. Yes, I did. It was a classic doing (..)2016 Zootopia