ADN Investigation

Your private detective agency based in the North of France and operating throughout the national territory.

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For the past 12 years, ADN has been offering investigations, inquiries, research, information, and private advice at the local, national, and international levels.

The ADN Investigation agency specializes in assisting individuals seeking usable evidence in criminal cases or civil disputes, such as divorce proceedings, child custody issues, monitoring minors, or person searches.

Our Private Detective agency also serves as the investigative arm of ProTein, providing Economic Intelligence services exclusively for professionals.



If the law is the foundation of our profession, ethics and professional conduct are the pillars. At ADN Investigation, our Private Detectives ensure:

  • Professional secrecy that begins from the first phone consultation
  • Teamwork with our clients and legal professionals (lawyers, bailiffs, etc.)
  • Complete independence: we take care to avoid conflicts of interest
  • Customized action with billing based on actual services, not inflated flat rates
  • Proximity to our clients: our offices are in Lille and in the Douai-Valenciennes area, and we regularly operate in Amiens and throughout France.


Are you looking for a private detective? ADN Investigation commits to:

  • Providing you with a team of Private Detectives from the agency, not just an individual
  • Advising and clearly explaining the steps of the investigation
  • Maintaining transparency on prices and providing accurate quotes before starting the investigation
  • Demonstrating high availability during cases based on your preferences and communication means
  • Collaborating, when necessary, with your lawyer, whether they specialize in criminal law, labor law, or divorce.

Our private detective agency

ADN Investigation, provides you with a team of private detectives dedicated to gathering intelligence. The goal is to compile a report that serves as evidence for various civil, family, non-family, and criminal cases.

Our private investigation agency takes pride in being part of top networks and working with absolute discretion. We are one of the few companies north of Paris that brings together multiple investigators, ensuring that an in-house solution is prioritized for your peace of mind.

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détective privé matériel filature enquête Lille

The Detective Agency Nord was founded in Lille 12 years ago, and our two offices can welcome you in the Hauts-de-France region. Our private investigators operate in Nord-Pas-de-Calais and Picardy, but we can also conduct investigations throughout France and abroad, either directly or with our partners on-site.

ADN Investigation is accustomed to working closely with legal professionals (lawyers, legal experts, judicial officers, etc.). Benefit from our expertise reserved for professional clients by engaging the same investigators. Hundreds of clients from the private and public sectors, as well as insurance companies, have chosen us for our professionalism, transparent pricing, and adherence to professional ethics.

The Detective Agency Nord is a licensed and approved private investigation firm with the CNAPS (the French Ministry of the Interior). We are a member of SNARP (the leading French syndicate for the profession) and part of the CII (Council of International Investigators), enabling us to tap into a global professional network. ADN is a founding member of the Association des Détectives Indépendants (ADI), allowing us to swiftly operate throughout France through our colleagues and provide you with quality endorsed by the association. Lastly, ADN Investigation represents the investigative branch of a company specializing in Economic Intelligence: ProTein.

détective Lille Surveillance Enquête


ADN Investigation is a limited liability company (SARL) specializing in investigations, inquiries, research, information gathering, and advice.


ADN Investigation

Searching for and finding a Private Detective throughout France and specifically in Nord Pas-De-Calais (59-62) in cities like Lille, Roubaix, Tourcoing, Béthune, Cambrai, Valenciennes, Hazebrouck, Douai, Arras, Lens, Dunkerque, Wasquehal, Croix, Mouvaux, Calais… In Picardy, in places like Amiens, Saint-Quentin, Laon, Beauvais… In Paris, throughout France, and internationally.

Investigations 7J/7 et 24H/24
Our partners

Check the accreditations and authorizations of our agencies on the CNAPS website

Leader’s accreditation number: AGD-059-2027-02-18-20220308234

Authorization to operate in Lille: AUT-059-2112-07-30-20130339414

Authorization to operate in Bersée: AUT-059-2116-04-27-20170603558

Civil and family cases

The search for missing persons, Adultery, Abandonment of the marital home, Child custody, Revision of compensatory benefits, Prenuptial investigation, Surveillance of minors


Criminal cases

Criminal or delinquent counter-investigation, Prevention of fraud and abuse of weakness

Bienvenue chez ADN Investigation
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