Detective Rey Solis is "a wiry, dark-haired Colombian emigre with a face like the surface of Mars." (Poltergeist, p. 41.) He is a homicide detective with the Seattle Police Department and his path has been crossing with Harper too often for his liking. Harper likes Detective Solis despite the way they keep meeting. In Underground, she describes him as smart, honest, and tenacious (p. 20).