Sophia and Emma Darling are sisters. They lived in Silicon Valley. Their father was a successful computer engineer. Their mother died when Emma was a toddler and Sophia had to help to take care of Emma. Emma was very adventurous growing up, but Sophia was not. They were on a cruise for Sophia's 18th birthday when the ship crashed. They spent days at sea before they found an island. There were people on it! Will they survive? Will Sophia ever find her true love? #usisland #usislandchallenge