Gilbert Morris 
Royal Handmaid (House of Winslow Book #32) 

Book 32 in the bestselling House of Winslow series. Wealthy Rena Matthews feels called to take the gospel to the South Sea islanders. She gathers volunteers to go with her–all from the upper strata of society. When rough-looking Travis Winslow volunteers, Rena wants to refuse him, but her father insists she take him along. They set out in her father’s yacht, but a storm drives them hundreds of miles off course and into a reef on a deserted island. Will they ever make it to the mission &supl;eld? Or will God bring the mission &supl;eld to them?