The sister of an American tourist killed in Thailand is thrust into a terrifying fight for survival while investigating her sibling's mysterious death. Lucy was visiting Bangkok when she made contact with a stranger online, and vanished without a trace. Now her sister Allie (Tammin Sursok) is determined to find answers, even if it means risking her own life in the process. Shortly after arriving in the bustling Thai capital, Allie falls in with charismatic ex-pats Michael and Marit, whose ties to a mysterious website suggest that she may be on the right path. Later, in a part of the city where few foreigners dare to tread, Allie realizes that she, too, may never make it back home alive.