The Enemy Within 1x12 "Sequestered" Season 1 Episode 12 Promo trailer - Acting on urgent intelligence from a captured Tal contact, Keaton and his team are able to intervene and stop the assassination of a high-profile congresswoman. Keaton has Shepherd interrogate the congresswoman, who had previously used Shepherd's treason conviction as a launching pad for her political career, leading to a stunning truth about the origins of Tal.