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.

Based on a true story, "The Other Side of Heaven" follows the journey of a young Mormon missionary named John H. Groberg as he leaves his family behind in Idaho to serve in Tonga in the 1950s. In a remote and unfamiliar place, John faces challenges such as language barriers, natural disasters, and cultural differences. Despite the hardships, he develops deep friendships, finds love, and experiences personal growth.