Returning to her own time in the 20th century, Claire must reconcile her future with the life and love she left behind. Shifting back to 18th century, Jamie, Claire, and Murtagh arrive on the shores of France to turn the tides of history, but quickly learn that Paris presents its own unique set of challenges.

Life in Paris is not without its trials as Jamie struggles to triumph over the traumas of his past. A fortunate meeting with Jacobite leader Prince Charles presents opportunities, while the Duke of Sandringham's presence brings complications.

Jamie's days and nights are dominated by political machinations, while Claire finds solace in her healing skills. As their plan to stop Culloden progresses, including engaging the aid of a young pickpocket, the past threatens to derail their forward momentum.

Claire and Jamie throw an elaborate dinner party intended to derail investors in Prince Charles' war effort. Meanwhile, Claire's revelation that Jack Randall is alive sparks Jamie in an unexpected way as he and Claire struggle to regain their physical intimacy.

Reunited, Jamie and Claire attempt to extinguish the fires their dinner party ignited; however, Claire is set off on an unexpected change of course. Jamie and Claire's relationship is put to the ultimate test when the past rears its ugly head.

Jamie and Claire use Claire's medical knowledge to devise a scheme to stop a wine deal which could fill the Prince's war chest. When Claire learns Jamie has gone back on his word, the couple are met with dire consequences that will forever change their lives.

Claire is brought to L'Hopital Des Anges where doctors try to save her life and that of her unborn baby. King Louis asks Claire to judge two men accused of practicing the dark arts - one an enemy, one a friend.

Claire and Jamie call upon Jamie's grandsire, Lord Lovat, in an attempt to elicit support for the Jacobite cause. However, a visiting Colum MacKenzie has other plans, and Lord Lovat's manipulative machinations ensure that no matter what, his own interests will be served.

Claire and Jamie reunite with the Lallybroch and MacKenzie men as they train for war. Jamie's power struggles with Dougal and Claire's personal battle with her memories of WWII weigh upon them, but new, helpful information comes to light when a young Englishman named William Grey...

Trusting in Claire's knowledge of "history," Jamie leads the Jacobite army into a critical battle with British opposition near the town of Preston. Meanwhile, Claire attends to the dead and dying, a reminder of the truest costs of war.

Claire and the Highlanders are sent north after the Jacobite leaders decide to halt their march on London. A band of redcoats makes trouble for the Scots, leading to a most unexpected reunion for Claire.

As Jamie puts all of his efforts into turning the Jacobite army away from the impending slaughter at Culloden Moor, Claire attempts to comfort the sick Alex Randall. She is stunned when Alex reveals an outrageous plan to save the mother of his child.

Flashing forward to 1968, Claire revisits the past and reveals to her daughter, Brianna, the truth about her parentage. Back in the 18th century, the day of the Battle of Culloden has arrived, and Jamie must do everything he can to save the ones he loves.