The search for the killer of Jenny, the resident ghost murdered 10 years ago, takes Jackaby and Abby to new and scary depths. In undertaking the task, they learn that something evil has been collecting the best scientists of their time (late 1800s) to build the future—without humans. Ending in a cliffhanger, be prepared to read the last book in the series as soon as this one‘s finished. #serieslove @TheSpineView @Andrew65 #litsyatoz #letterG