Set on a US bomber over Europe in WW2, the crew of the Liberty Belle is sent on a mission to bomb a church in the dead of night. Though they successfully level their target, their mission isn’t over as they are attacked by an unholy demon that was summoned by a blood ritual just before. A bloodbath ensues as the demon slaughters one crew member after another, until the final two are barely able to defeat it with the critical help of a deceased crew member's holy cross.