Father Mahon and Sister Ann McKeon are missionaries on a South Pacific Island threatened by rebel forces. After a brutal attack leaves the village without a leader and Father Mahon dead, Sister Ann calls for help are answered by Captain William Wicker and his Army Special Forces Unit. They've been called in to train the islanders to defend themselves. The children think the Wicker is an "angel in green" - but his violent military lifestyle conflicts with Sister Ann's peaceful beliefs. But she finds herself attracted to the 'Angel In Green'.