Deep Space Nine NECESSARY EVIL 2x08

This hard-boiled detective story involves Odo and Kira five years ago when Deep Space Nine was under Cardassian occupation as Terok Nor. Who killed Mr. Vaatrik and why?

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Gul Dukat has returned, and back in the day he charged Odo with investigating a murder mystery. Open cases don`t sit well with Odo, and now Quark`s life has been threatened. Kira is involved, but who is Ches`sarro? Why was he killed? Who killed him? Who killed Vaatrik? Is Mrs. Vaatrik to blame? This is one of the best Star Trek \"who-done-it?\" episodes.

I summarize the plot and point out and explain all the references so you don’t have to