A serial killer on island

Please help me to find this movie

A bunch of teenagers go to an island to party. Three of them (a boy and two girls) go into a cave to smoke, and one of girls finds other two peoples dead bodies. Then she runs away to warn the others but she also gets killed.

SPOILER ALERT

There is a policeman with them, and he is the murderer. He writes his next victim’s name on whiteboard in the bar.

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