Don't bother calling the police as they wouldn't know how to handle this type of fraud, unless there is a "Fraud Division". What I would do is get all the documents that were filed with the county and make an appointment with the District Attorney's Office. They should be able to help with this. You did not provide enough details for me to give you a better answer. Was this done with a quit claim deed? What Attorney handle it? This information would be found at the Dept of Real Estate in Riverhead.
Wish I could help you more but as I said not enough information to go on.