Treason

S1, E7: Nikita and other Section One agents go on a mission that goes horribly wrong, resulting in several deaths. Believing that someone in the organization must have betrayed her and her colleagues, Nikita traces the information leak to a Section One operative, Roger, who admits that the intended target kidnapped and threatened to kill Roger's young son in order to get the information. With help from Section One, Nikita rescues the child, but Roger's desk at the Section is soon mysteriously vacant.