Jake Fisher discovers a secret town hidden in the far reaches of Northern California. When he discovers the town, he finds it abandoned . . . a town with no people. But he notices something: while there is no one around, there are many, many doors.
When he eventually gets inside Ostium he learns that every door has a specific number. None of the doors will open for him, until he starts with the first door.
It opens and begins a journey for him that will take him far away from his normal life, through many more doors leading to different places in time and space . . .