Sub-Commander T'Pol receives a covert mission from the Vulcan High Command, and informs Captain Archer that Admiral Forrest will be contacting him later about it. She remains tight lipped despite Archer's enquiries as to the exact nature of the expected diversion, but later meets privately with Archer and asks that he comes as well, since she needs someone she trusts. In conversation with Archer, she later reveals that she was trained 17 years earlier in reconnaissance retrieval, and now she is to capture one of six surgically altered, rogue Vulcan secret agents that eluded her before.
Archer, T'Pol, and Ensign Mayweather, easily track the fugitive, Menos, to a cantina on the icy Pernaia Prime moon. After a brief phase-pistol fight, they capture him, but are unable to leave due to a build up of acidic ice. Menos starts to play on T'Pol's sense of fairness and honor. He has a good life, sustaining his family with an honest job, but apparently he is dying. T'Pol, trying to disprove his story, searches for biotoxins in his ship, but is unable to locate any. Meanwhile, back on Enterprise, Commander Tucker finds the continual interruptions of command more than he expected. It gets worse when a Vulcan ship arrives, and he impersonates Archer so as not to let the Vulcans know the Captain is away.
T'Pol also relates to Archer that she's been having recent flashbacks to her previous hunt, where she shot another fugitive called Jossen. Because of the Vulcan ramifications on killing, she received "fullara" treatment on P'Jem, where her memory and emotions of the incident were fully repressed. Back on the planet, Menos organizes an escape by starting a fire, but is recaptured by the away team when his cloaked hiding space is detected, confirming that he was indeed smuggling biotoxins as the Vulcan High Command had indicated. On Enterprise, T'Pol offers her support to Archer should he ever be in need of it.