OH NO! Pete please come home to safety!
I know this sounds stupid, but are you ABSOLUTELY sure he is outside, and not just hiding really well? Have you checked everywhere?
Maybe you could put out tuna and a few cat beds with the other kitties scent on it to draw him closer to your house. Make sure to check under your cars, and under the hood.
I am praying for Pete's safe return. PLEASE keep us updated.