Dan Brown's The Lost Symbol
Season 1 Episode 6
Diophantine Pseudonym
Oct 21, 20216.4 rating
Mal'akh pressures Langdon and Peter to decipher the clues. Katherine, Nuñez and Sato try to regroup.
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More from this season
S1 E1
As Above, So Below
Young professor Robert Langdon is pulled into a complex mystery when his mentor is kidnapped.
S1 E2
The Araf
Robert and Katherine get help from an old friend while trying to decipher the most recent clue.
S1 E3
Murmuration
With the CIA on their trail, Robert and Katherine turn to Nuñez for help; Sato interrogates Bellamy.
S1 E4
L'Enfant Orientation
Forced to split up, Langdon follows the next clue while Katherine joins Sato to find her father.