The night before their high school graduation, Jessie and her friends are guided by a 'Find My iPhone' app to recover her lost device from a house whose demented tenants are hell bent on making her a flesh and blood member of the family.
In a terrifying post-apocalyptic world inhabited by gangs divided into factions, a husband and wife race desperately across the countryside in search of safety and must work together as they are pushed to the breaking point in order to survive.