On the way to Scotland, Jamie is pulled back into the Revolutionary War. William is sent on a covert mission. Roger and Brianna struggle to adapt to life in the 1980s.

Jamie and Claire help civilians flee Ticonderoga after the fort falls into British hands. Roger discovers the identity of the mysterious 'Nuckelavee'.

Jamie prepares to face British forces in battle. Roger and Brianna question Buck MacKenzie’s intentions in the 20th century. William fights in the First Battle of Saratoga.

Claire and Ian arrive in Philadelphia to help the ailing Henry Grey. Roger and Buck receive an unexpected clue in their search for Jemmy.

Claire turns to John Grey for comfort as they process difficult news. Ian and Rachel discuss their love and their future. Brianna confronts an intruder at Lallybroch.