A beautiful waterfront house, a Swedish flag fluttering in the wind. A sailboat tied to the wooden deck below. This is the setting of the friends' annual Midsummer celebrations. The friends are gathered at Emil's family house and the herring lunch, sauna, games and compulsory skinny dipping are as always prepared. Expectations are set - Micke worries about his highly pregnant wife and the fastest way to the nearest hospital. Eva is looking for some distraction from her recent split with Patrick and Sam. Emil's college buddy from the States arrives with his own expectations of Swedish sin. Wannabe singer-songwriter Anders hasn't told his wannabe pregnant girlfriend Maria about his low sperm count and hopes to solve the problem over the weekend. To top it off Emil's surprise seems to lift the party to unprecedented heights. If everything had gone according to plan that is.

Tyler is a surfer who constantly searches for good surfing spots. When he's traveling through Mexico, he finds one of the best places he has ever seen. He invites his brother Colin to join him and his friends in surfing the wild Mexican waves. Colin gathers 4 friends and leaves for Mexico but is surprised that nor his brother nor his brother's friends are there. They start realizing that there's something wrong with the beach, a curse that says that no one will leave the beach alive...