Welcome to an exam-cheating business run by Lynn, a straight-A student who gets the idea for her business after helping Grace and Pat. Grace is a prominent school activist who can’t get the grades she needs. Pat is a filthy-rich boy who believes money can buy anything. Lynn’s business skyrockets and the money starts to flood in as scores of students offer her cold hard cash in exchange for exam answers.

The film centres on a group of Mattayom 6 (Grade 12) students who meet in Siam Square to attend one of the cram schools. Jublek (Morakot Liu) is mad at her best friend May (Eisaya Hosuwan) and that leads them to split from the others, disappearing out of sight from their tutor school classmates. A group of boys led by the foul-mouthed Mon (Nathasit Kotimanuswanich) is also hanging round. They have a neat little racket going, uploading shows to YouTube and charging per view. They’ve heard that a ghost lives in the cram school they attend but when they try and find the spirit find themselves in hot water.

After a series of deaths in a small provincial town, a determined detective attempts to uncover the killer — and British expat Earl is the prime suspect.