In 1852, Abbie's father moves the whole family to Matinicus Rock to be the lighthouse keeper there and Abbie becomes his assistant. She learns to care for the lights, keeping them clean and lit in order to guide ships around the treacherous rocks along the shore. Then her father has to make an emergency trip to the mainland for supplies. A violent storm hits and Abbie has to care for her younger sisters, her ailing mother and the precious lights. This exciting adventure is based on the true life of Abbie Burgess who helped care for the lighthouse for 22 years.