Missionary John H. Groberg returns to Tonga in the 1960s with his wife and their five young daughters. When their sixth child is born with a serious illness, the Grobergs face their ultimate test of faith, only to find themselves surrounded by the love and prayers of thousands of Tongans. Barriers of inter religious strife are soon broken down as all unite in hopes of a miracle that will save the baby's life, as well as the life of a Tongan minister's son.