Why this is harder than it should be
From the outside, a firm that has run cases for decades and one that started last month can look identical: the same stock photographs, the same list of services, the same promise of discretion.
The practical consequence is a market where a website, a phone number and a list of branch offices that do not exist can be assembled in a weekend. Most of the complaints we hear about other agencies are not about failed investigations — they are about money taken for work that was never meaningfully attempted.
The five checks that matter
1. A verifiable physical office. Not just an address on a contact page. Look for a Google Business Profile tied to that address, with reviews and photos attached to it. An agency operating only from a mobile number is harder to hold accountable.
2. You speak to the investigator. Ask directly: will the person I am talking to be running my case? In a small firm the answer is yes. In a sales-led operation you will be handed to someone else after payment, and you will re-explain a sensitive situation to a stranger.
3. A written scope before money. Objectives, methods, cities, timeline, deliverable and fee, in writing. An agency that will not put its method in writing is an agency whose method you should not accept.
4. Stated limitations. This is the single most reliable test. Ask what they cannot do. A legitimate firm will tell you plainly: no call records, no bank data, no account access, no guarantees. An agency that says it can get those is either breaking the law in your name or lying to you.
5. Branch claims that hold up. If an agency lists fifteen city offices, ask for the address and who runs that office. Virtual addresses are common. An honest answer — "we coordinate that city through investigators we work with" — is better than a fictional branch.
Score every agency on your shortlist
Run each agency you are considering through these eight points and give one mark for each. It takes about ten minutes per firm on a single phone call, and it separates working agencies from websites faster than anything else you can do.
| What to check | Score 1 if | Score 0 if |
|---|---|---|
| Physical office | A real address with a Google Business Profile attached to it, carrying reviews and photos | Only a mobile number, or an address with nothing verifiable behind it |
| Who runs the case | The person on the call confirms they will run it themselves | You will be handed to someone else after payment |
| Written scope | Objectives, methods, cities, timeline and fee in writing before any money | A verbal quote, or payment requested first |
| Stated limitations | They tell you plainly what they cannot obtain | They claim call records, bank data or account access |
| Branch claims | Named offices with a named person, or an honest “we coordinate that city” | A long list of city offices nobody can describe |
| Pricing basis | A fixed fee that does not change with the finding | A success fee, or a price that rises if you get the answer you wanted |
| Null result | They can say exactly what you receive if nothing adverse is found | They are vague, or imply a finding is guaranteed |
| Reviews | On a verified profile, spread over time, with specific detail | Only on their own website, with no external source |
Six or more is a firm worth engaging. Four or five is worth a second conversation. Three or below, walk away — not because they will necessarily cheat you, but because you have no way to hold them to anything.
Two points carry more weight than the rest. An agency that will not state its limitations in writing is the one most likely to take money for work it cannot do, and an agency that charges more for a particular finding has a reason to produce that finding.
Six questions to ask on the first call
- Who will actually run my case, and will I deal with them directly?
- What exactly is included in your quote?
- How many field days does your quote include, and what happens if more are needed?
- Will you verify this claim at source, or review documents?
- What exactly is the deliverable, and what happens if nothing is found?
- Is the fieldwork done by your team or subcontracted, and who supervises it?
The answers to questions two and five tell you most of what you need. An agency that is vague about its limitations, or that cannot say what you receive if nothing adverse is found, is selling an outcome rather than a service.
Promises that should end the conversation
Call records or CDRs. Bank statements or account balances. Phone location tracking. WhatsApp or email access. Aadhaar, PAN or income tax extracts. A guaranteed finding. A fee that depends on the result.
Each of these is a sign the agency is selling a promise it cannot keep. A firm that guarantees a result before seeing the facts is telling you what you want to hear, and a fee that rises with a particular outcome gives them a reason to find it.
What a legitimate engagement looks like
A free scoping conversation that is genuinely useful even if you do not proceed. A written scope with objectives, methods, cities, timeline, deliverable and a fixed fee. A part payment to commence rather than the full amount upfront. Agreed contact arrangements including when and how you may be reached. Updates at a stated interval. And a report that distinguishes what was observed from what was inferred, and states plainly what could not be established.
If an agency is uncomfortable with any part of that list, the discomfort is the answer.
Talk it through before you commit to anything
If this guide leaves you unsure whether your situation needs an investigator, the quickest way to find out is a short call. It is free, and you will get a direct answer — including when the answer is that nothing should be commissioned.