Stuck in Millwood without a case and no firm to return to, Joanna is at loose ends on what to do next until a whistleblower comes forward.

New leads bring Joanna and Billy to make the horrific discovery of a massive dumpsite on farmland near the school. Joanna’s father takes over as lead counsel and it becomes clear that they’re running out of time.

On the eve of Luna's trial, Joanna reaches out to an old client when she discovers a new piece of evidence that will lead her to the identity of the real killer. Billy attempts to get help for Shane but is forced to make an agonizing choice.

As Luna's trial starts, Joanna and Billy defend against an avalanche of evidence. With things not looking good, Joanna risks everything by putting an unexpected witness on the stand.

Coming off the loss of class certification, Joanna and Billy decide to go after ClearDawn alone, turning to the only lead they have - an unreliable whistleblower.

Joanna and Billy head to trial against ClearDawn labs while still desperately searching for a way to expose the fraudulent science used to wrongfully apprehend children. Season finale.