Below in order, every episode of this season
with comments and reviews by our members.
In 1948, a pregnant Claire moves to Boston with Frank. Their relationship is tense, and she struggles to adjust to her new life as a housewife. She gives birth to Jamie's daughter. In 1746, Jamie finally kills Jack Randall at the battle of Culloden. Jamie and Rupert survive the battle and take refuge in a farm house with other Jacobites, but Jamie's wounds are grave. They are caught by redcoats, and Rupert is executed. Just as Jamie's turn comes, he is recognised by Lord Melton, the elder brother of the boy—John Grey—whose life Jamie spared before Prestonpans. Bound by honour, Melton secretly removes Jamie from the farm house and sends him home to Broch Tuarach, expecting him to die en route..
Baby Brianna has brought Claire and Frank closer, but the memory of Jamie stands between them. Searching for fulfillment, Claire enrolls in medical school as the only woman in her class. Jamie, still struggling to come to terms with life without Claire, has survived for six years at Lallybroch, but with the English still searching for him, he lives in a cave as an outlaw. Soldiers come to Lallybroch repeatedly, harassing Jenny and Ian for information about Jamie's whereabouts. When Fergus loses a hand in a run-in with redcoats, Jamie arranges to be "caught", so that Jenny can claim the reward and the English will leave his family alone.
Claire graduates from medical school. Years later as Brianna graduates high school, Frank tells Claire he wants a divorce so he can marry his mistress and return to England. They are poised to argue over where Brianna will live, but Frank is killed in a car accident. Jamie is serving time in Ardsmuir Prison, where he is the leader and spokesman for the Scottish prisoners. His uneasy relationship with the new governor, an adult Lord John Grey, evolves into friendship. When the prison is shuttered, Murtagh and the rest of the prisoners are sent to the American colonies as indentured servants, while John paroles Jamie to work at a private estate called Helwater.
Claire and Brianna, with the help of Roger Mackenzie, research history to track Jamie to Ardsmuir, but when the trail runs cold, they return to America. Serving as a groom for the Dunsany family, Jamie is blackmailed into sex by heiress Geneva. When she and her earl husband die, leaving their newborn son Willie an orphan, Geneva's sister Isobel keeps the secret that the child is really Jamie's. Years later, when the young earl's resemblance to him is becoming obvious, Jamie leaves Helwater, with Willie in the care of Isobel and Lord John, who are engaged to be married.
In December 1968, Roger arrives in Boston having discovered a clue to Jamie's whereabouts in 1765. Brianna urges Claire to go back and reunite with Jamie, and mother and daughter have a tearful farewell. In Edinburgh in 1765, Claire finds Jamie in a print shop.
Claire and Jamie are reunited. She shares photos of Brianna, and he tells Claire about his son Willie. She also learns that Jamie prints subversive material, smuggles wine and spirits, and lives in a brothel owned by his associate, Madame Jeanne. Claire is reunited with an adult Fergus and delighted to meet Jenny's son, Young Ian. Claire and Jamie spend the night at the brothel, re-consummating their marriage and their love for each other. While Jamie is out on a business errand, Claire finds herself in danger from a rummaging intruder who threatens to have his way with her. Claire fights back, resulting in a sudden "catastrophe".
Dodging a blade, Claire's attacker trips and falls, suffering a critical head injury. Refusing to let him die, Claire insists an attempted trepanation but is unable to save his life. Ian arrives desperately looking for his son, Young Ian. Jamie claims he has not seen the boy, though young Ian has surreptitiously been working for him smuggling alcohol. Interrupting his very first romp with a lass, Young Ian is confronted by an intruder at the print shop, who discovers Jamie's treasonous pamphlets. In the melee, the shop is soon consumed by fire, but Jamie saves the boy.
Jamie takes Claire and young Ian home to Lallybroch. Claire is enraged and threatens to leave when she discovers that Jamie has married a twice widowed Laoghaire. She also struggles to regain the trust of Jenny, who is suspicious of her return and still oblivious to the truth of Claire's origins. Laoghaire accidentally shoots Jamie during a confrontation with him and Claire. Jamie recovers thanks to the penicillin that Claire has brought, and he explains to her his reasons for marrying Laoghaire. Ned Gowan negotiates a settlement with Laoghaire, and Jamie decides to retrieve the treasure on Silky Isle to pay for it. Young Ian swims to the island in an injured Jamie's place. Jamie and Claire are horrified to see the boy forcibly taken aboard a ship and carried away after finding the treasure.
Learning in France that young Ian's ship is heading for Jamaica, Claire and Jamie pursue it on a trading ship, the Artemis. At sea, Fergus reveals that Laoghaire's daughter Marsali is aboard, and they seek Jamie's approval for their marriage. The ship loses wind and the crew is about to kill one of Jamie's men as a "Jonah" (man of bad luck) when the wind returns. The British man-of-war Porpoise stops them and seeks help, her crew stricken with a plague. Claire determines that the disease is typhoid fever and trains them to stop its spread, but the ship carries her off with the captain's promise to leave her in Jamaica to wait for the Artemis.
On the Porpoise, Claire struggles against suspicion from some of the crew, but eventually manages to stop the spread of the disease. She discovers that the captain knows Jamie's true identity and plans to have him arrested in Jamaica for treason and murder. When they go ashore, she tries to escape but is apprehended by the captain. That night at sea, a woman named Annejke encourages Claire to jump overboard using an empty barrel as a raft, as the current will carry her towards land. Meanwhile, on the Artemis, Jamie is confined after threatening the captain, wanting him to sail faster in pursuit of the Porpoise. He tries to get Fergus to help him take control of the ship, but Fergus instead persuades the captain to let Jamie rejoin the crew after he promises not to mutiny again.
Claire swims ashore, and walks inland, struggling to survive the harsh tropical environment. She is found and taken in by Father Fogden, a runaway priest. In passing, he tells her of a cave in Jamaica where people have been known to disappear. A few days later, the Artemis reaches the island, needing to make repairs after a storm, her captain having died. As the ship is about to sail, Claire attracts Jamie's attention from the beach using a mirror, and they are reunited. Back on the island, Fogden marries Fergus and Marsali. The next day, Jamie, Claire and the crew set sail for Jamaica.
Geillis is holding Young Ian prisoner in Jamaica. She makes him drink tea that compels him to tell the truth about Jamie and the treasure. Jamie and Claire reach the island, and Claire gets into an altercation at the slave market. Jamie buys her the slave, Temeraire, to defuse the situation. They attend a ball thrown by the new governor, who they discover is Lord John. Claire is reunited with Geillis, who offers to help with their search. At the ball, Margaret Campbell prophesies that a king will rule Scotland again when a two-hundred-year-old child is killed. Fergus sees Captain Leonard arrive, and warns Jamie, who flees. Temeraire tells Claire and Jamie that Geillis is holding Ian. On their way to Geillis's villa, Jamie is arrested by Leonard.
Claire is captured whilst searching Geillis's slave houses for Ian. The governor's troops recover Jamie from Captain Leonard, and Lord John sets Jamie free after Leonard is unable to produce any evidence of his alleged crimes. Meanwhile, Claire tells Geillis about her return to the 20th century, and Geillis realises that it is Claire's child who must die before Scotland wins its new king. Jamie frees Claire, and they rescue Ian from Geillis, who is killed by Claire during the struggle. The group sets sail from Jamaica, but are shipwrecked in a storm. Jamie saves Claire from drowning, and they are washed up together on the shore of the American colony Georgia.