"The Light at Tern Rock" is a children's novel by Julia L. Sauer, first published in 1951. The story follows the adventures of young Ronnie and his dog, Mr. Pertwee, who are sent to live with their aunt and uncle on a remote island off the coast of Maine. Ronnie is initially reluctant to leave his home in the city, but he soon discovers the joys of island life and becomes fascinated by the local history and folklore. In particular, he is intrigued by the story of the Tern Rock lighthouse, which has been unmanned for years and is said to be haunted by the ghost of the last keeper. When Ronnie's uncle is injured in a fishing accident, Ronnie takes it upon himself to light the lighthouse and guide the ships safely to shore. With the help of his new friends on the island and the guidance of an old sea captain, Ronnie overcomes his fears and learns the value of courage, responsibility, and community. The novel is a heartwarming and uplifting tale, with a strong sense of place and a gentle message about the importance of perseverance and self-reliance.