[2][3] Joy (Ploy Sornarin) is hired as a housemaid by a wealthy family consisting of Uma (Savika Chaiyadej), Nirach (Theerapat Sajakul), and their only child and daughter, Nid (Keetapat Pongrue).

Mrs. Wan (Natanee Sitthisaman), the head housemaid, reminds Joy not to pry into the affairs of their employers.

Joy experiences odd occurrences around the house, and - ignoring Wan's warning - sneaks into Uma's study at night.

During a party she murders Uma, Nirach, household staff, and guests, before setting the house on fire and leaving with Nid.

The South China Morning Post said the "screenplay is clumsy, and the director’s slow-burn approach does the film no favours.