Taking an urban legend about a violent sexual manoeuvre is an interesting starting point for any movie, especially a thriller. When it’s then followed with clever plotting that involves friends constantly turning on each other, what you have is ninety minutes that is far better than a lot of the supposedly titillating and nauseating rubbish that reaches a much wider audience. Three young British girls head off to Ibiza to party. Four lads lure them onto a boat, and a sexual misadventure leads to carnage, via a variety of weapons. It’s bloody brilliant. Literally.

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