Unbearable heat. A young boy is doing to his friend unusual favor - pretended to be him, visited his grandmother who has senile. A woman takes him for a walk to a place that evokes memories and she tell him about the biggest mystery of her life.

Innocent lives hang on the whim of an elusive psychopathic murderer whose strange riddles and impossible timelines force three people into a mission to end the game before one or all of them die.