Are you afraid to die? Kiefer Sutherland isn't. He's an ambitious, charismatic medical student who persuades classmates Julia Roberts and Kevin Bacon to take part in a reckless experiment. To see if there is life after death, they will kill themselves: temporarily shut down ("flatline") their heart and brain functions to briefly experience clinical death. After Sutherland survives the first experiment, the others flatline for increasingly longer intervals. But their horror begins when they realize that although they've come back alive... they haven't come back alone.