stolen 1989 Schwinn Paramount 564

I had just bought the bike from a nice middle aged woman who took great care of it. Got it home aired the tires, washed it, lubed it and took it out on our maiden voyage just to make sure everything functions properly on the bike. Got home stood the bike by my front door on my porch and went inside to make a quick bite to eat and get water. Came back outside and it was gone. Didn't have the bike for even 24 hrs and it was gone. It was my mistake to not lock it but u figured hey I'm just running in to make something to eat and get water nobody will steal it. Boy was I wrong. Please help me get my bike back. Thank you