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Really, this spot sucks and I don't know.

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I couldnt agree more with this quote. If I were heads up I would just call down against this opponent. Since this pot has another guy in there that did call a flop bet, I would fold hoping the other guy can keep the villain honest. I think the chances that the villain somehow has something combined with the chance that the other guy has a hand makes folding the best play. But I honestly think the turn is very close between folding and raising. I really dont see how the villain has a hand, and the other guy may not call if the hero raises the turn. Given that I think both plays are close in expectation I will take the low variance route and just fold the turn.