Echoes on Serpent's Pass

My family's car broke down on a haunted mountain pass. A demonic tiger stalked us in the dark, but a mysterious ambulance saved us. When we arrived, my family remembered nothing. Our car was perfect, our rescuer was a ghost, and I was the only one who knew the truth. Now, trapped in the city, I still hear the ghostly siren wailing my name. It saved me once, but I fear its next arrival won't be a rescue. It's a reminder of a debt I never agreed to pay.