Lyta is convicted there is a "sleeper" spy on Babylon 5 and she wants to send the password to each major crew member to root out the spy. Sheridan is concerned that it is an invasion of privacy, but when someone tries to kill Lyta, he allows her to do it. Ivanova (CLAUDIA CHRISTIAN) initially refuses the procedure--she has never allowed a mind scan because her mother abused her by probing her thoughts constantly. Ivanova eventually admits to Sheridan that she herself is a latent telepath--an admission that endangers them both, since she is not registered with the Psi Corps. When Lyta finally does link with Ivanova's mind, she finds that she is not the spy.

When the station's commercial telepath, Talia Winters (ANDREA THOMPSON), enters the room and Lyta sends her the password, Talia's personality is instantly changed. She becomes furious and tries to kill Lyta. Talia, whom everyone loved and trusted, is a Psi corps spy, unwittingly gathering information for the day when they would use her. Fortunately, Sheridan did not include Talia in the small group of officers who are secretly investigating a conspiracy involving the assassination of the president on Earth, but she did learn about the "underground railroad" of escaped telepaths.

Before leaving the station, Lyta has a rendezvous with the enigmatic Vorlon Ambassador Kosh--the two seem to be very familiar with each other.