GRIMOIRE: A book of magic spells and invocations The Interstate Reaper hasn't been in action for over two years. Chief Calhoun, number one in the Texas Rangers wants the Reaper found and put behind bars so he can close the open cases. Gillette Hart, serial killer specialist, is given the case and with almost nothing to go on, she recruits her brother, Ardal, and her dog, Pete, and together they follow the Reaper's trail.