The story revolves around the people of Sète, France. Their lives are punctuated by family rivalries, romance and scenes from daily life, but also by plots involving police investigations, secrets and betrayals.

The Section de recherches is a special unit of the Gendarmerie nationale, responsible for the most complex cases. In Bordeaux (from 2006 to 2013) and then in Nice (since 2014), child abductions, disappearances, heinous or sexual crimes are the daily lot of the investigators in this research unit. In the search for witnesses, the team is authorised to extend its investigations beyond France's borders.

The stars of French football are celebrating the end of the season with a high-profile party full of glitz and glamour. But a scandal erupts when star player Fodé Thiam violently headbutts his coach and uses a racist slur against him, inciting angry demands to exclude Fodé from the team. The club hires Sam, a brilliant but emotionally unstable PR fixer, to diffuse the crisis and save the team's future.

Eric and Ramzy prank fans by inviting them on the set of what they believe is their new “Zorro” in Spain for a week, yet everyone but Boris is an actor.