Pemmer Harge wrote:
"PALLRA: I don't care what you think you know, shape-shifter. You will never be able to prove that I killed my husband, because I didn't.
ODO: I know."
That blew my mind the first time I saw it. Despite knowing by that point that DS9 was no TNG, I wasn't thinking far enough morally out-of-the-box to see that coming.
In fact while I enjoyed the backstory on Kira and Odo, and the fun they had with the film noir style, as I watched I was thinking the episode was rather predictable. I was like, "did they really expect me to believe for a moment that the first officer was actually the murderer?"
And then that final scene.
That was the last time I underestimated DS9's willingness to take the characters down the darker path.