When the FBI discover a mysterious ciphered document, they call in one of the best cryptanalyst: Will Scott. As he tries to balance fatherhood and his work, what he deciphers puts his own life at risk.

Will tries to figure out who Kurt was working for, and he returns to Claire's so they can crack the rest of the ciphered list together. Other ominous, interested parties give the FBI investigation team reason to be concerned about who this crypto-analyst "Will" actually is and which side he's on.