It happens occasionally when the site hangs up in the middle of deleting something. The post gets deleted, but the "last post" field doesn't get updated, so it doesn't show up in the topic list.
Stickying. If this happens to you, let me know, it's pretty easy to fix. (Or, as suggested, keep it on watched topics so you can find it that way; making a new post will fix it.)
FAQ: Why did my mafia thread disappear?
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