Wyoming Sheriff Walt Longmire is back in the saddle for a third thrilling season. After winning his heated re-election as Absaroka County sheriff vs. his ambitious deputy Branch Connally, Walt now faces a stampede of problems both personal and professional. Last season, Walt and his deputies each braved a storm and did it nobly. But for every storm, there is an aftermath.

Deep-sea explorer Brock Lovett has reached the most famous shipwreck of all, the passenger liner Titanic. Emerging with a safe believed to contain a diamond called "The Heart of the Ocean," he finds that the safe does not hold the diamond but a drawing of a beautiful woman wearing it. When Brock is interviewed on TV, he shows the drawing to the cameras. A 100-year-old woman named Rose Calvert recognizes the woman in the drawing as herself! On a visit...

At the start of World War I, German imperial troops burn down a mission in Africa. The mission's clergyman was so overtaken with disappointment that he passes away. Shortly after his well-educated, snooty sister Rose buries her brother, she must leave on the only available transport, the 'African Queen' steamboat. The boat is manned by the ill-mannered bachelor, Charlie. Together they embark on a long difficult journey, without any comfort. Rose grows...