In this third book in the Guinivere Jones series, Guinevere and Zachariah are feeling doubts about each other's commitment, exacerbated by Zacariah's employment by a modern female executive (nicknamed 'Queen Elizabeth' by Guinevere) who is looking for a sperm donor.
The mystery this time involves Gwen's artist neighbor across the way who has a painting slashed and decorated with occult symbols. Gwen sees the damage through the window as she gets her morning coffee and through signals the two arrange to meet for the first time, at which point Gwen volunteers Zach to help out with the neighbor's problems.