Royal Handmaid: 1935 (House of Winslow #32) by Gilbert Morris

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 field? Or will God bring the mission field to them?