"A Secret Kept From All the Rest"[1] is the nineteenth episode of the first season of Batwoman, and the nineteenth episode overall. It aired on May 10, 2020.
When members of Gotham's intelligentsia begin disappearing, Commander Kane, Sophie and the Crows go searching for the newest homicidal threat to the city. In the meantime, Kate is consumed with someone’s betrayal and starts questioning the loyalty of everyone around her just when she needs them most. So when Luke and Julia go missing, Batwoman must rely on Mary and a former foe to deploy her rescue mission. Meanwhile, Alice enlists Tommy Elliot to help acquire an elusive item that her sister also seeks.[src]
When Alice uses the glasses, the camera cuts to show an excerpt from the journal. The relevant passage reads: "During the resurrection of Ra's al Ghul, Batman... suit of armor from Talia al Ghul, The Suit of Sorrows. According... its legends, it can impart strength and speed of its wearer but also would completely corrupt anyone whose heart and soul is not pure. At first, the Dark Knight was dubious of the legend, but eventually experienced an aggressive behavior while wearing the armor during patrols. Batman later learns from a member of The Order Of The Pure, a splinter faction of The Order Of St. Dumas, that the armor once belonged to a knight named Sir Geoffrey de Cantonna, who massacred hundreds of people in an alpine valley in 1190. The Suit of Sorrows becomes one of the trophy displays within the Batcave, to remind the Dark Knight that he must be ever vigilant not only in his crusade against crime, but also himself. The new Azrael takes up wearing the suit eventually."
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Batwoman Season 1 Episode 19 A Secret Kept From All The Rest Promo The CW