In "The Mannequin," Isabella Gómez stars as a stylist assistant who uncovers her sister's tragic fate in a historic LA building, only to be stalked by a vengeful ghost of a serial killer with a dark past that still haunts the premises. With its stylish aesthetic and technically proficient filmmaking, this horror thriller promises a chilling experience, but critics caution that it falls short in execution, delivering a formulaic and dull ride.