: A six-month time jump shows Langdon still at Harvard, far from Katherine in D.C.. Because the 10-episode season exhausted the plot of the novel, the series ended there. The Ending The Lost Symbol Season 1 Explained - Looper
: Mal'akh takes Katherine to the tunnels beneath the Washington Monument , planning to use the "Cascade" resonance device to achieve apotheosis (becoming a god) through a ritualistic human sacrifice. The Lost Symbol - Season 1Eps10
: Robert and Katherine decide to take their relationship slow, with Robert returning to his academic life at Harvard. : A six-month time jump shows Langdon still
: Robert Langdon intervenes, shattering Mal'akh’s delusions by revealing the true nature of the "ancient wisdom." In the ensuing struggle, Katherine stabs Mal'akh with his own sacrificial dagger to save Robert, and Mal'akh dies in Peter’s arms. The "Lost Symbol" Revelation : Robert and Katherine decide to take their
: As the resonance device begins to threaten the structure of the monument, Nuñez manages to disrupt the machine.