My name is XXXXX XXXXX I am an experienced criminal
When you are a suspect in a criminal matter, the only time you should ever go talk to the police about this incident is if you show up to see them with counsel. Otherwise, you should not
We have a 5th Amendment right against self-incrimination, and of course the police know it, but they reach out to you anyway, usually sounding very friendly in the hope that they will get a confession from you. That confession would tie the hands of your lawyer when it comes time to trying to make a deal for you, if you are inclined to try to dispose of whatever this turns out to be about.
Additionally, if they don't presently have enough to arrest you, the last thing in the world you want to do is help them to find more evidence.
In matters like this, what you don't say about this incident can never be used against you. But anything you admit to or corroborate can be used against you. So don't call the detective back at all. As detectives don't usually reach out over email, this may not be legitimate communication anyway, so ignore any contact via email. If he calls you, ask what this is about and then tell him that you want to speak to your lawyer before talking to them.
The detective won't be happy, but he will know that this is a fundamental right that he has to accord to you, and he is then supposed to leave you alone. At that point, you can look for a local lawyer to talk to, just in case. He or she can reach out to the police on your behalf to determine whether it's worth your while showing up to speak to them with counself. (It usually is not).
So what should you do? Nothing right now. If the police could arrest you, they wouldn't email or call. So don't give them any information about whatever they are contacting you about.
While I'm thinking about it, there are people who email and say they are a detective but who are actually internet scammers. When you contact them, they make you feel like you are in trouble and then they ask you for money for "bail" or some other nonsense. Legitimate police don't work this way, so that's another reason not to respond to the email.