White Night takes place over two parallel time periods. The main period, the present day, depicts the unravelling of the Hébert family following the premature death of their mother Louise “Loulou” Hébert (France Castel). A parallel era, the years 1970 to 1975, retraces pivotal moments in young Loulou’s (Rose-Marie Perreault) life -a wrenching time when her adored husband Vincent (Antoine Pilon), a militant and activist, alongside his accomplice Bertrand (Simon Pigeon), was forced to abandon her and flee the country.
A striking encounter with her mentor, Aidrian (Nico Racicot), allows Louise to become a supermodel and to finally launch her first perfume, White Night, the success of which will allow the creation of her Nocturne empire. Over the years, often out of necessity, but also out of choice, Louise has given up certain political ideals and has become a formidable businesswoman. Everything changes on the evening Loulou is found dead, alone in the garden of her estate after a reception highlighting her great accomplishments. Accident or murder?