Outlander by Diana Gabaldon

The novel follows a World War II nurse who accidentally time travels back to 18th century Scotland. There, she meets a handsome and brave Scottish warrior and is torn between her loyalty to her husband in her own time and her growing love for the warrior. As she becomes more entwined in the past, she must navigate the dangers of a time not her own, including political unrest and violence, while trying to find a way back home.

The 1022nd greatest book of all time