A visiting Lwaxana Troi becomes enamoured with Odo after he retrieves a stolen item of hers from a thief. Meanwhile, an alien computer program wreaks havoc with the station's systems.

After a Cardassian man arrives on the station suffering from an illness that he could only have contracted at a Bajoran labor camp during the Occupation, Major Kira leads an investigation to determine whether he is actually a notorious war criminal.