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Hell's Rebels doesn't really have investigation, but it has a lot of social and RP opportunities. My group finds it kind of annoying when they can't negotiate with something.
Council of Thieves has more of an urban investigation feel, though when I played it (second half only) it sometimes just felt like fighting the same rogues over and over again.
Zeitgeist is a 3rd party AP in a steampunk setting that might interest you. I played through the beginning, and the non-combat stuff was fun (though all the combats were gimmicky and eventually got on my nerves).