content: A more engaging novel than the two previous in the Harmony series, Ghost Hunter is the tale of Cooper Boone, ghost hunter guild boss of the Cadence suburb of Aurora Springs, and Elly St. Clair, daughter of a guild boss with a new psi talent, the ability to resonate with plants. Cooper and Elly are on the trail of some drug dealers and a 'blue freak,' a hunter who can make and manipulate blue ghost energy, something previously unheard of.Because of the nuances of these two rare psi talents, I found this story to be more interesting. Castle is a master of creating a world and then building up on it. Her paranormal romances resonate with exciting twists. Really, it's like reading three genres at once: romance, science fiction, and mystery. I would definitely recommend this book to a fan of any of those genres.