[3.5 + PF] Murder Mystery Module?

[Palanan]

Can anyone recommend a module that presents an intelligent murder mystery? Preferably low-level, ideally something that requires some careful thinking and roleplaying.

I'm open to third-party if anyone knows of something that would fit, and even older editions if there's any nostalgic favorites that made for a memorable game.

[Doctor Awkward]

In Heroes of Horror, there is a creepy scenario called Annalee's Baby that involves a the ghost of a man haunting his wife and unborn child. It's an ECL 5 encounter, and it has a lot of neat background in it that could be expanded to cover more than a few sessions.

[Aergoth]

Heroes of Horror also covers the issues of spellcasters, divination magic and whatnot as they relate to mysteries