Outlander is the first book in a popular historical romance series by Diana Gabaldon. The story follows Claire Randall, a World War II nurse who mysteriously travels back in time to 18th-century Scotland. There, she becomes entangled in the Jacobite risings and finds herself torn between two men: her husband in the present and a Scottish warrior in the past. With its blend of romance, adventure, and time travel, Outlander has captured the hearts of readers around the world and spawned a successful television adaptation.