I Know This Much Is True

After paranoid schizophrenic Thomas Birdsey has a violent public breakdown, Dominick Birdsey finds himself stepping up to defend his identical twin brother in unexpected ways. As he navigates the fallout, Dominick reflects on their childhood growing up under the tyrannical rule of their volatile stepfather, Ray, and their desire to know the identity of their biological father.

Tensions rise between Dominick and his live-in girlfriend, Joy, as the media begins to take an interest in Thomas' case. In his attempt to have Thomas released from the Hatch forensic institute for the criminally insane, Dominick finds a potential ally in social worker Lisa Sheffer, but learns that helping his brother may be more difficult than he thought.