Detective Valentine is called upon to solve the case of the missing tree number 170 at the gardener’s request. However, unaware of what awaits him, the detective interrogates a series of individuals to track down the thief. Eventually, a business card he stumbles upon by chance leads him to a psychologist. This psychologist, who stole the 170th tree after stealing 169 others, had also killed as many people as the trees he had taken. Just as he tries to add Detective Valentine as the 170th victim next to tree number 170, he is unexpectedly betrayed, and the authorities arrest him and his accomplices.