Passer-by: someone who passes a particular place casually or by chance, especially when something unusual happens. That is the least to say for main character Katherine. Her world is thrown completely upside down when she takes a 'trip' down into an unknown valley near her school after hearing a strange voice call out to her. When curiosity takes over, she finds herself becoming The Passer-By of a new place with a mysterious adventure. Will she choose to go forward, or go back? Read and find out. Choose your path, go along for the journey, and remember: stay alive.