As an expedition of seven climbers in the Himalayas nears a Chinese village, conditions worsen to the point that in blind instinct, they consider murdering the villagers for supplies.

In an average town that has been remarkably peaceful in previous years, a mysterious and murderous criminal known as "Slenderman", begins a rampage that leads to mass suspicion all over the town. Told from the point of view of both the police force and the students of the city, "MONSTER" is a thrilling horror story about a serial killer in a town that has yet to know how powerful their enemy is, or how far he will go to plunge the town into ruin and despair.