Rainbows on the Moon — Barbara Wood

“I was born for adventure. I flout convention. I am a New Woman on a holy purpose.” Newlywed Emily Stone and her husband, Isaac, are young missionaries who have traveled from New England to Honolulu to share the Gospel with the Hawaiian natives.

Gentle, adventurous, well-bred, and beautiful, Emily soon finds herself struggling with intense homesickness but remains determined to share her faith . . . and ignore her growing feelings for handsome Captain MacKenzie Farrow. Just as she begins to bond with the influential High Chiefess Pua and her daughter, Mahina, unexpected tragedy threatens to force her off the island. In a state of confusion, Emily makes a decision that could destroy everything she knows and loves―including her own sanity.
Three decades later, Sister Theresa comes to the islands as a missionary nurse and becomes acquainted with Captain Farrow's charming son, a powerful man who is instrumental in Hawaii's alliance with America. Theresa discovers that a dark curse is plaguing his family and the island's inhabitants, a curse that only Emily and Mahina can help her reverse. With richly imagined characters and spellbinding scenery in the tradition of James A. Michener's Hawaii, Rainbows on the Moon is a masterful depiction of the beauty of human emotion.