 In this section we inspect the prospects for treating Fitch’s reasoning as invalid. Is Fitch’s epistemic reasoning in order? Is the logic of knowability classical logic? More to the point: does the knowability principle carry with it special considerations that warrant the revision of classical logic? If so, does this logical revision invalidate Fitch’s reasoning? And if the reasoning is invalid, are there closely related paradoxes that threaten the knowability principle without violating the relevant logical standards? 