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.
(..) of you guys... I guarantee they will never send you back up here again. Good. So, if we go for it, how would it work? I plot the course and execute it. Remote override. They could take over the from mission control. (..)2015 The Martian