"The ghost is
Taking the prisoner's long, wavy hair into account, the jailed thief must be none other than Wendigo Donner, whom Claire first encountered in the season-five finale.
Some think Jamie's spirit (but not his body) traveled to through time to guide Claire to him; others suggest Jamie had a near-death experience after the Battle of Culloden, and that's why his ghost is 25 when he appears to Frank.
Diana Gabaldon mentions now and then on social media that Fergus knows Claire is a time traveler. This is something that happens off-book in the series. Fergus and Marsali have both learned the truth, which is important for later books.
Geillis Duncan
Geillis (Lotte Verbeek) is the first time traveler that Claire encounters in Outlander. After Claire first time travels to 1743 Scotland, Geillis suspects that Claire is from the future.
In the novels, Marsali and Fergus apparently know. They haven't been told on-page, but Diana Gabaldon confirms that the two know that Claire, Bree, and Roger are time travelers.
For now, though, it appears both Fergus and Marsali aren't time travellers with actors Lyle and Domboy addressing this in an Instagram live Q&A from earlier this year.
After he's interrogated, John asks Jamie to assure him that Claire will be safe, at which point Jamie reveals that Claire is his wife. Jamie ostensibly still plans to kill John, but an angry Claire argues that there's no evidence that John is a spy.
Claire, Jamie and Young Ian return from America to visit, just in time to be with him as he dies, and Jenny whoops and sheds tears at seeing her son again after so long. Claire tells the entire family her true identity of being a time-traveller from the future, but Jenny still views her as a 'witch' or 'faery-woman'.
In Scotland in 1968, Claire tells Roger Wakefield that Geillis Duncan was his ancestor and that she was burned as a witch in 1743.
She's never seemed curious about the intimacies of a couple before. This suggests that she's up to something. Watching the two gives her information to use in the future.
Catholics here in Europe we wear our wedding ring on the right hand. Plus it goes deeper for Catholics. Remember Jamie is a "Papist" catholic.
Yet, even with so many people suspicious of her, there are plenty of characters who know that Claire is a time traveler. As the number of time travelers on Outlander increases, the secret understandably has become harder to keep. But the more people who know, the more Claire and her family could be in danger.
Later, after Claire has returned to the Ridge, she is confessor to Allan Christie, who explains that he was the one that fathered Malva's child, and then murdered her.
Jamie denies having slept with her, but the damage to his and to Claire's reputation is done—and the bond between the Frasers and Malva is severed, until just a few weeks later, when Claire finds Malva murdered in the garden.
“I curse you. I curse you with knowledge, Jack Randall. I give you the hour of your death. Jonathan Wolverton Randall, Born Sept 3rd, 1705, dies…” she whispers in his ear, and suddenly he knows that she's telling him the truth.
The money Jenny receives for selling her brother out will go toward keeping the people of Lallybroch alive. Jenny doesn't want to go along with the plan initially, horrified at the idea of turning Jamie in and worried that he'll be hung for treason.
Janet "Jenny" Fraser Murray: Jamie's older sister, and only living sibling. She is married to Ian Murray and has seven children.
Just as she begins to worry that Jamie might be capable of lying to her, Jamie quells her fear by revealing to her his indiscretion with Mary MacNab, a woman who worked at Lallybroch, while Claire was back in 1968 with Frank and Brianna. This confession soothes Claire, and the two find themselves realigned once again.
Did you guess Lord John Grey? Because yes, Claire and Lord John end up married in book seven, and yes, they drunkenly (and full of grief for the loss of Jamie, whom they both love with all of their heart) consummate that marriage.
Grey falls in love with Jamie, who rejects his advances. Still, Grey cannot dismiss his feelings.
At the start of the eighth book, Jamie reveals that he is alive. He had been on another ship with Jenny. He does find out that Claire and John married, and it ends his friendship with John.
Well, Fergus is believed to be the son of the comte and Amelie Beauchamp.
Henri-Christian is born as the fourth child of Fergus and Marsali. He is a dwarf and some of the residents of Fraser's Ridge believe he is a punishment for his parents' sins.
As a time traveler, he has lived during the 1630s and possibly other eras. He first attempts to travel forward beyond his own projected lifetime in 1778, with the help of Master Raymond.