Claire is a young woman who leads a somewhat formatted life. Pierre is an improviser, but not an actor. Brief encounter, brief romance, doomed or not, who can say? When things like that happen, you act on the spur of the moment.

Isa and Marie bond while working in a French sweatshop and soon begin sharing an apartment that Marie is watching for a hospitalized mother and daughter. Marie, hoping to avoid a life of struggle and poverty, takes up with Chriss, a nightclub owner whose most attractive asset is his money. Isa recognizes the ultimate futility of the relationship and tries to keep Marie away from him, but her interference puts their friendship at risk.

The series follows the adventures of lighthearted Jean-Paul Moulin, a police Commissaire, and his team as they solve crimes.