You Cannot Be Sirius! (Unabridged‪)‬

John Walker had a surprise in mind for his wife. His satellite radio had a surprise in store for him. The voice on the radio, a person named Zell, offers to solve all of John’s problems for him. In return, John has to agree to a small, insignificant payback. 

Insignificant, of course, is a relative term, especially when you are dealing with the Devil.