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My answer is


Devious @Deusovi has beaten me to the punch. However, I thought I'd write mine up anyway, just for the sake of a slightly different logic stream: Here's the logic:


First of all, the 'real' puzzle: Now, we start in Time for some case-bashing! (This may be doable more cleanly, but this works and it's not too difficult.) So this gives two shaded cells: With that shaded cell, And this gives a unique solution:


Unfortunately this seems to be an invalid Sudoku. It has multiple solutions, and therefore there is no logical next move.

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