Doctor Bashir gears himself up for a medical conference on Casperia Prime, one of the vacation planets. Unfortunately, his trip is cut short before it even starts. Starfleet Intelligence has reason to believe that their is a spy aboard Deep Space Nine and all evidence suggests that it's a member of the senior staff. Interviews are conducted by Internal Affairs in order to find out if their is a spy or not.

Stardate: 51762.4 Tom Paris, who has been unusually moody, has his spirits lifted after Voyager rescues a pilot and his spacecraft when it gets into trouble. Paris asks to work with Steth, the pilot, to repair the advanced co-axial warp drive on his ship. After the sip is repaired, Steth pulls a fast one by switching bodies with Paris. Paris, now unconscious, is sent away in the ship, and Steth, in Paris' body, is left to live his life out on Voyager.

Sam is called to the scene of the death of a Gemma Boyd, who appears to have fallen down the stairs. Sam believes that she has actually been pushed and sets out to find her killer.