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I Know This Much Is True
故事发生在20世纪康涅狄格州的三河市，多米尼克（马克·鲁法洛 Mark Ruffalo 饰）是一个陷入了水深火热之中的男人。他曾经拥有一个幸福美满的家庭，却因为刚刚出生的孩子的意外死亡而导致了和妻子之间感情的破裂，不仅如此，多米尼克的弟弟托马斯（马克·鲁弗洛 Mark Ruffalo 饰）患有妄想型精神分裂症，常常会做出伤害自己的举动，需要身为哥哥的多米尼克处处提防。 在弟弟最终还是自杀身亡之后，多米尼克决定从自己的血脉中寻找答案，于是开始研究在很早之前就离开了他的父亲的真实身份，由此发现了自己家族所隐瞒的有关遗产的秘密。
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.
Sheffer preps Dominick for a pivotal hearing with Hatch’s review board that could decide Thomas’ fate. A chance encounter with an old classmate brings painful childhood memories to the surface. Dominick reflects on his and Thomas’ time together at college, during which he met Dessa and the signs of his brother’s illness first began to manifest. Joy attempts to remedy the problems in her and Dominick’s relationship.
Despite the protestations of those closest to him, Dominick returns to work before fully recovering from his accident. Heavily medicated, Dominick recalls the disturbing incident that lead to Thomas’ first hospitalization while counting down the hours to Thomas’ hearing with the Hatch review board.
Upon learning the details of his Sicilian grandfather's arrival in the early 1900s to Three Rivers, Dominick becomes convinced his family is cursed. A startling update on Thomas from an unlikely source prompts Dominick to take drastic action.
A lifetime of animosity between Dominick and Ray spills over in public at an inopportune time. After an unexpected tragedy, Dominick seeks reconciliation with those he has hurt. Series finale.
