When a group of close-knit friends assemble for the marriage of Skylar and Dan, they have no idea they will witness The Rapture and face a series of catastrophic events turning the celebration into a life-or-death struggle.

Young musician Zach Sobiech discovers his cancer has spread, leaving him just a few months to live. With limited time, he follows his dream and makes an album, unaware that it will soon be a viral music phenomenon.