Stardate not given: Lieutenant T'Lyn compiles a report for the captain of the Vulcan cruiser Sh'vhal. She was transferred to the Cerritos for disciplinary reasons and wishes to return. Three Betazoid ambassadors come aboard the ship on a classified mission, for which radio silence is implemented, so T'Lyn can't send her message. Soon the crew starts to party boundlessly and act crazy. Captain Freeman decides to take the three ambassadors to sickbay. She suspects one of them may suffer from a Betazoid condition known as Zanthi fever that would telepathically transfer their emotions to the crew. T'Ana finds no indication of Zanthi fever in them, but they turn out to be agents of the Betazoid intelligence service and take control of the bridge. Meanwhile back in sickbay, Mariner and T'Lyn notice that the Vulcan lieutenant is the source of the heightened emotions on the ship. She is frustrated about not being able to send her message and afraid that she may not have enough Vulcan mental discipline, which has an impact on the crew. After Mariner assures T'Lyn that everything about her is very Vulcan, the condition improves, and the crew returns to normal. On the bridge, as the three Betazoids begin to argue after reading each other's minds, Freeman manages to alert security. She turns around the ship just before it enters the Romulan Neutral Zone. T'Lyn decides to stay on the Cerritos. As the three agents beam off the ship at Betazed, they give Freeman a PADD with intel gathered on the mystery ship.

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