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 defence, Michael considers an opportunity to tell his story in a documentary; after learning shocking information about her stepfather, Caitlin wrestles with doubts.

As the DA's office attempts to solidify their case, shocking new details surface about Michael's past that threaten to derail the defence.

After an unexpected homecoming, a critical discovery rocks the Peterson household; Michael's fate hangs in the balance as the trial ends.

It's 2004, and in the aftermath of the verdict, Michael and his family struggle with the court's decision.

In 2006, Sophie pursues a far-fetched new theory about Kathleen's death; in 2017, Michael grapples with compromising his principles in exchange for his freedom.