Lucie Borleteau’s second feature outing, Chanson Douce , is an adaptation of Leila Slimani’s eponymous novel . Myriam, a mother of two, decides to return to work despite her husband’s reservations. They find Louise ( Karin Viard ), a babysitter who immediately wins the affections of the children. Soon, however, a co-dependent relationship ensues and eventual tragedy.
Followed by a Q&A with actress Karin Viard.
More info 
https://www.institut-francais.org.uk/cine-lumiere/whats-on/special-screenings/lullaby-qa/