And the Dark Secret

Season 4 · Episode 401 · TV14 · First aired December 13, 2017

A secret sect of the Vatican Church unearths a map detailing the locations of the four cornerstones of the Library of Alexandria; Flynn and the Librarians work with an unexpected ally to stop them before the stones can be used to destroy the Library.

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Cast and crew

Rebecca Romijn and 2 more
Cast
Rebecca Romijn, Christian Kane, Lindy Booth

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