Francis (Xavier Dolan) and Mary (Monia Chokri) are good friends.
One night, they meet Nick (Niels Schneider), a young man from
the country who has just settled in Montreal.
From encounter to encounter, from moment to moment, troubled
by innumerable signs – some real, some imagined – Francis and
Mary fall deeper and deeper into their fantastical obsession. Soon, they find themselves on the precipice of a love duel that threathens the friendship they once thought indestructible.