Doorkeeper has lived for an eternity and more, the unyielding guardian of the Ways of time and space. His task: to reveal to mortals the consequences of their choices. He does not interfere.

But then he meets a doomed warrior. A boy with an imaginary friend. A would-be king. A world-weary musician. A priest with a crisis of faith. A scientist faced with the ultimate choice.

And Doorkeeper travels with them.