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.
(..) You know the kid that they're looking for-- Sulley let her in. We tried to send her back but Waternoose had this secret plot and now Randall's right behind us and he's trying to kill us! You expect me to believe that pack of lies, Mike Wazowski?! Mike Wazowski! (..)2001 Monsters, Inc.
(..) a ride in the car. Please, Fungus? I'm sorry, Wazowski, but Randall said I'm not allowed to fraternize with victims of his evil plot. ( gasps ) ( clanging ) Hmm... ( zapping ) ( electrical whirring ) (..)2001 Monsters, Inc.