Musso Detektivbyrå is one of Sweden's most trusted private investigation firms. Our experienced investigators carry out professional inquiries – from background checks to complex assignments – with absolute confidentiality.
Musso Detektivbyrå was founded in 2020 with a clear mission: to give individuals and businesses access to professional, discreet and legally sound investigations. We handle everything from infidelity checks and custody disputes to corporate espionage and undercover assignments.
Each case is handled personally by experienced investigators with backgrounds in intelligence and security. We work in a structured, methodical way and always within the limits of the law.
A complete range of investigation services for individuals and businesses – always discreet, methodical and legally sound.
Suspecting infidelity is one of the hardest situations to be in. We carry out discreet observation and documentation to give you clarity – whatever the answer is.
Read moreIn custody disputes an independent investigation can be decisive. We document the actual circumstances around the child – objectively and in a way that holds up in court.
Read moreDiscreet mobile and static surveillance with professional documentation. We gather information about a person, vehicle or place – in family and business matters alike.
Read moreDiscreet, legally sound profiling where we deepen knowledge of individuals in sensitive contexts – ahead of a partnership, an inheritance or a legal process.
Read moreStructured project management and discreet intelligence-gathering. We investigate internal irregularities, fraud and other misconduct within your organisation.
Read moreSecure your hiring and protect your business. We deliver tailored background checks of key people, partners and potential investors.
Read moreFor companies that suspect false or misused sick leave. We conduct discreet observation and give you a fact-based basis for action.
Read moreIn particularly complex cases we can run undercover operations – where an investigator gathers information that is otherwise inaccessible. Always within the law.
Read moreWe collect, analyse and verify information from open sources – the web, databases, social media and public records. Effective, discreet and entirely lawful.
Read moreWe identify and eliminate the risk of unlawful eavesdropping in your premises, vehicles or digital devices, with technical sweeps and concrete recommendations.
Read moreFour typical situations – and how we work our way to a factual, usable result.
A client suspects their partner is seeing someone else during claimed work evenings and trips.
We carry out discreet mobile surveillance at the relevant times and document movements, locations and meetings with photos and timestamps – without the person noticing.
The client receives a factual report with documented observations, providing clarity and, if needed, usable in a separation process.
A parent is worried about the child's wellbeing with the other parent and needs objective documentation ahead of custody proceedings.
We map the living situation, daily routines and any shortcomings through observation – always within the law and with the child's best interests in focus.
A structured, factual account the client and their counsel can use as evidence in district court.
An employee is on long-term sick leave for burnout, but the employer has indications the person is fully active at the same time.
We conduct discreet observations during the sick-leave period and document activities inconsistent with the stated diagnosis, fully in line with regulations.
The employer gets a fact-based basis for dealing with the insurance authority, the HR process or a labour-law measure.
An employee cites a work injury as the reason for absence, but the employer suspects the injury did not occur on the job.
We investigate the circumstances, gather relevant documentation and conduct observation where justified – always proportionate and legally sound.
A clear account that helps the employer make correct decisions on insurance, work-environment or personnel matters.
A clear, structured way of working in six steps – no surprises.
We discuss your case confidentially and make a free initial assessment. You only need to share as much as you feel comfortable with.
We draw up a tailored investigation plan with clear goals, methods and timelines. You approve the plan and pricing before we start.
The investigation is carried out professionally with ongoing updates. We adapt the strategy based on what emerges along the way.
All evidence is documented carefully with photographs, timestamps and written observations – usable in legal contexts.
You receive a professional investigation report with all findings, evidence and conclusions. It can be used in court, in HR matters or as private documentation.
We remain available for questions, additions and advice even after the investigation is complete. Your peace of mind is our priority.
Discretion, methodology and legally sound documentation – see how we take on an assignment, from first contact to the finished report.
Sweden has no specific law regulating private investigators, but that does not mean an investigator can work without deep legal knowledge. On the contrary – it demands even more.
A professional investigator must navigate a complex framework of interacting laws. Knowing where the line runs – and how to work right up to it – is the core of the profession. We also cooperate continuously with the Police and other authorities.
Musso partners with leading security and intelligence organisations worldwide to offer end-to-end solutions.
We also work continuously with the Swedish Police and other authorities. If, during an investigation, we discover ongoing illegal activity, a crime already committed – or indications that a crime is about to take place – we always act in accordance with Swedish law and contact the relevant authorities.
Yes. All our investigations are carried out within the framework of Swedish law. We use lawful methods and document in a way that holds up in legal contexts. In any borderline cases we inform you in advance.
Confidentiality is the core of our work. We communicate through secure channels, store information encrypted and never share your data with third parties without your explicit consent.
The cost varies with the complexity and scope of the case. We always make an initial free assessment and provide a clear quote before work begins.
Yes. Our documentation and reports are designed specifically to be usable in legal proceedings – including custody disputes, divorces and criminal cases.
Yes, we cover all of Sweden and take on international assignments when needed. Contact us wherever in the country you are.
We respond to enquiries within 24 hours and can often begin an investigation shortly after. For urgent matters, call us directly.
Your first conversation is always confidential and free of charge.
Tell us briefly about your situation. Your email goes straight to our team and is always treated confidentially – we reply within 24 hours.
Send email Call 010-183 98 32