Night of the Mannequins by Stephen Graham Jones

Trade paperback format. 

Award-winning author Stephen Graham Jones returns with Night of the Mannequins, a contemporary horror story where a teen prank goes very wrong and all hell breaks loose: is there a supernatural cause, a psychopath on the loose, or both?

We thought we'd play a fun prank on her, and now most of us are dead.

One last laugh for the summer as it winds down. One last prank just to scare a friend. Bringing a mannequin into a theater is just some harmless fun, right? Until it wakes up. Until it starts killing.

Luckily, Sawyer has a plan. He'll be a hero. He'll save everyone to the best of his ability. He'll do whatever he needs to so he can save the day. That's the thing about heroes--sometimes you have to become a monster first.

Suffused with questions about the nature of change and friendship, "Night of the Mannequins" is a fairy tale of impermanence showcasing Graham Jones's signature style of smart, irreverent horror. --The New York Times