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.
(..) - the social highlight of the season. - Of the season? This is gonna be a celebration the likes of which this town's never seen! She doesn't plan, she plots, doesn't she? - Mama, look, the Governor's coming. - He better. Let me see. Oh, boy. - All right Savannah, where are we at? - We're now. (..)2004 The Notebook