Sophies18thbirthdaypartybecomesabloodbathwhensixterrifyingmonstersdescenduponherhouse,intentondevouringthepartyguestsandkillinganyonewhotriestoleave.Asherschoolfriendsaretornapartandeaten,Sophiemustrallyabandofmisfitsandtakeuparmstosendtheirpartycrashersbacktohell.Tosurvivethenight,Sophiewillfaceherdestiny;monstersarereal-andshestheonlyonewhocanstopthem.