Now, that pledge has been broken. One of the four has been killed in action. And the remaining three are the only men alive who know the awful truth about their friend's death.
Each is left to deal with their secret in his own way. One of them will accompany his friend's body home to Boston. One of them will defy orders in an act of protest. And one of them will decide it's up to him to single-handedly win the war.
In the end, Vietnam may claim more than their lives. As the war grinds on, their very souls are at stake. And their shattered friendship will prove either their salvation... or their ruin.