Meet innocent Jim, terrified of girls, and on a reluctant quest to prove his manhood the night before he turns 30. He and his cocky friend Alex think they've hit the jackpot when they meet the beautiful siblings Kitty and Lulu, who seem up for anything on a wild party-fuelled night. But little do they know that the femmes fatales want to make Jim lose much more than just his virginity - Getting laid has never been so bloody difficult. 即将30岁的吉姆情路坎坷，他的好友亚历克斯怂恿他在生日前成为真正的男人。二人在餐厅邂逅青春美貌的姐妹花凯蒂和露露，并相约在伦敦酒吧正式约会。两对俊男靓女如期相会，这时吉姆收到妈妈的信息催促他回家庆生，露露提议随他一同回家。另一边，亚历克斯对凯蒂表达爱意被拒，恼羞成怒向她泼酒。这一行为引得凯蒂对其萌生杀意，幸而被返回酒吧的露露制止。凯蒂颇有深意地邀请吉姆和亚历克斯去家中做客。当四人来到位于郊区的家中，凯蒂终于露出真面目。原来她一心想要使用秘术复活父亲，吉姆便是她的最后一个目标。一向听命于姐姐的露露不忍吉姆落入死地，和盘说出实情欲放他一条生路。但丧心病狂的凯蒂却没有给他逃亡的机会。吉姆命悬一线，眼看父亲复活无望的凯蒂更加疯狂，内心痛苦挣扎的露露最终决定大义灭亲，了结姐姐从而结束惨剧。屋外警笛声响起，露露被警察带走。
