In 2001, author and aspiring local politician Michael Peterson is charged with murder after the suspicious death of his wife Kathleen.

While working on his defense, Michael considers an opportunity to tell his story in a documentary. Then, after learning shocking information about her stepfather, Caitlin wrestles with doubts.

In the aftermath of the verdict, the Petersons struggle with the court’s decision, and Michael finds solace in an unlikely friendship from thousands of miles away.

After navigating a possible retrial, a 73-year-old Michael confronts a life-changing decision. Meanwhile, Martha and Margaret each share long-buried truths, and Sophie comes to terms with a revelation.