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 ask the bank for money? Apparently. Do you have any idea of the capital that this bank has invested in you, Gru? With far too few of your sinister plots actually turning a profit. How can I put it? Let's say this apple is you. If we don't start getting our money back... (..)2010 Despicable Me