As per the author:
When psychological counselor Megan Chase promises listeners to her new radio call-in show she’ll slay their personal demons, they believe her. So do the personal demons.
Megan doesn’t know she’s the only human alive without a personal demon on her shoulder. This, coupled with her psychic abilities, makes her a valuable weapon for any demon mob-like “family” lucky enough to gain her allegiance. It also makes her a serious threat not just to the personal demons, but to a soul-sucking Legion of Hell known as The Accuser. The Accuser already has an old score to settle with Megan, and sees this as the perfect time to do it.
The author also states: “The Megan Chase books are fairly light-hearted…”