In France, every major city has its Research Unit. Every time a murder, a disappearance or a rape occurs, this elite team of Police steps in.
Uniting experienced investigators, forensic, computer specialists, ballistic experts, the Research Unit uses all its skills to solve the most complex cases.
But it is also a group of men and women, with their strength and weaknesses, their qualities and their flaws, who are able to forget all their problems and get united when it comes to solving a crime.