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.
(..) to talk to you about for some time now. What? What's wrong? Um... I miss being evil. Sinister plots, large-scale crimes, it's what I live for. I mean, don't you think there's more to our future than jelly? Well, I'm also considering a line of jams. (..)2013 Despicable Me 2