Alec and the team take on a kidnapping case at the request of a desperate father.

Their investigation is hampered by a complicated family dynamic that slowly reveals everyone’s hidden motivations.

Air Date: Monday, Oct. 16 (10:00PM – 11:00PM) on NBC.

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THE IRRATIONAL -- "Zero Sum" Episode 104 -- Pictured: Brian King as Jace Richards -- (Photo by: Sergei Bachlakov/NBC)