Trapped in a London subway station, a woman who's being pursued by a potential attacker heads into the unknown labyrinth of tunnels beneath the city's streets
Mona Bergeron is dead, her frozen body found in a ditch in the French countryside. From this, the film flashes back to the weeks leading up to her death. Through these flashbacks, Mona gradually declines as she travels from place to place, taking odd jobs and staying with whomever will offer her a place to sleep. Mona is fiercely independent, craving freedom over comfort, but it is this desire to be free that will eventually lead to her demise.
Berlin, 1930, during the rise of Nazism. Hermann Hermann, a Russian emigrant and chocolate manufacturer, married to the capricious Lydia, loses his temper more and more every day when dealing with his workers and other businessmen; until he meets Felix, a vagrant, who seems to be physically identical to him; a disconcerting fact that leads Hermann Hermann to plot a particular way out of a fake world he actually hates.
An enigmatic vagrant cons himself into the home life of an arrogant upper-class family, turning their lives into a psychological nightmare in the process.