They all went to save themselves. But only one went to kill. Six strangers make the pilgrimage to a remote retreat, nestled in Bolivia's salt flats, famous for ancient salt rituals and traditional medicines. Each has their own story, each desperate for a cure. Cut off from of their day-to-day lives, strangers become family. But when a dead body is found the morning after a ceremony, everything they thought they knew about themselves - and each other - is turned on its head. Now stranded at the retreat, time is quickly running out. As tensions rise and temperatures plummet, how far will each member of the group go to ensure their own survival?