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.

As a gendarmerie chief warrant officer, Isabelle Florent and her team are faced with the most diverse investigations. As a mother, she tries to protect and educate her son, Nicolas.