Across the U.S.A

You live in Paris, your surname is Renard and you are 26 years old. You've recently received a message from New York, together with a plane ticket and a check. "Please come urgently, I must see you. A letter is waiting for you in New York. " Who is he, what does he want from you? There is no name, no explanation, only the initials J.P.S. Choose the locations you will visit and explore the mystery while you explore the city of New York.