两个不善社交的少女，一天晚上无聊，转向互联网寻找恐怖故事。他们在一个令人毛骨悚然的网络上找到了一个游戏，声称你可以用你的手机来召唤超自然...如果你输了比赛...你失去了生命

　　Two sisters living separate lives on different continents are reunited on a Mediterranean Island. The two barely have time to bond and revive family ties as Kate, the elder, meets a group of locals and agrees to an exciting ride on a hot air balloon. But disaster strikes and as the result of a freak accident, the balloon is carried far out to sea. Their cell phones out of range, and the balloon running out of gas, Kate and her friends are battling for their lives. While, back on land, the younger sister, Liz, has become an unwanted "material witness" to a crime. Matters then take a dramatic twist, one that will mark their lives forever.