As the season begins, Noah sits behind bars after being charged with the murder of Alison's brother-in-law. But with only circumstantial evidence to go on, the police may have trouble proving Noah's guilt.

In the show's third season, both Alison and Helen find themselves grappling with guilt over their involvement in Scotty Lockhart's untimely demise and letting Noah take the fall for it.

This season, a Marine veteran working with victims of post-traumatic stress disorder develops a strong rapport with Alison, who's now employed as a grief counselor. Sanaa Lathan joins the cast as the flinty principal of Noah's charter school.

In the aftermath of horrific events, Noah and Helen try to come to terms with the consequences of their choices. Just when things seem to have stabilized, a chance encounter with someone from the distant past sets in motion a sequence of events that brings them both to their knees. They realize they must face their past in order to truly move on. And some years in the future, Alison and Cole's now adult daughter Joanie attempts to piece together the truth about what happened to her mother, bringing the final season of the critically acclaimed series full circle.