By chance, she meets Paul (Bouli Lanners), a 43-year-old man who works as a detective and leads a solitary existence after his wife's death.

Upon its screening at the Rome Film Festival, All Cats Are Grey was positively received with a standing ovation from the audience.

[3] On the review aggregator Cinebel, the film has received a weighted average score of 8.2 out of 10, based on 11 critics.

[5] Fernand Denis of La Libre Belgique called Dellicour's direction a "polished work" which displays a "sense of observation and a tone that mixes harmoniously humor and existential angst".

[7] Louis Danvers from Le Vif wrote that the young Manon Capelle and Bouli Lanners form a "very convincing couple".