The FBI's Behavioral Analysis Unit hunts humanity's worst nightmares. But there are nightmares humanity doesn't dream are real. The BAU sends those cases down the hall. Welcome to Shadow Unit. The Shadow Unit series was created by award-winning authors Emma Bull and Elizabeth Bear. Contains Wind-Up Boogeyman by Elizabeth Bear Cuckoo by Emma Bull and more by Elizabeth Bear, Leah Bobet & Will Shetterly, and others.