Newbie mom receives strange message from a man claiming to be her son that compels her to look for the truth

Private Investigator

So, in 2004, a man introduced himself as a private detective. The first line he said over the call was more than enough to confuse her. At first, she couldn’t understand why a person with this profession will call her as neither did she do anything wrong nor suspicious. Then what could have been the reason behind this call?