Tom and Clara are two struggling academics in their mid-thirties, who decide to take their first holiday in ten years. On the flight over to Indonesia, Tom experiences a debilitating panic attack, which he keeps hidden from Clara. At the resort, they meet Madeleine, a charismatic French woman, her Australian partner, Jeremy, and five-year-old son, Ollie, and the two couples strike up an easy friendship. The holiday starts to look up, even to Tom, who is struggling to get out of his own head. But when Clara and Madeleine become trapped in the maze-like grounds of the hotel during 'the fogging' - a routine spraying of pesticide - the dynamics suddenly shift between Tom and Clara, and the atmosphere of the holiday darkens.