The film plays most effectively — which is not quite to say that it plays effectively — as a story of two couples, Lee and Marina (a Russian-speaking Michelle Trachtenberg), drifting part, and Jack and Jackie, coming together. As the less well-documented, less fabulous pair, there is more room to move with the Oswalds, for the writer and the actors to make them their own. (Trachtenberg has the least-thankless job here; most viewers will have no conception of Marina to measure her against.)
JFK was shot and killed by Oswald as the presidential motorcade travelled through the streets of Dallas. The idea of a conspiracy theory to kill Kennedy is momentarily addressed.
Oswald, in turn, was gunned down by Dallas native Jack Ruby.
In January 1964, Jackie moved out of the White House and bade farewell to the people of America, thus ending Camelot forever.