The Gettier Problem, when properly understood, has a straightforward solution. My main thesis—my ‘Gettier conjecture’—is that gettierized subjects fail to know in virtue of their justified true belief depending causally and evidentially on something they fail to know. Inferential knowledge (i.e., knowledge of a conclusion) requires knowledge of all the premises on which one’s conclusion depends causally and evidentially. This chapter is a first effort in trying to support this thesis. Section 2 discusses the Gettier conjecture, the notions of evidential and causal dependence, and applies the conjecture to the original Gettier cases. Section 3 looks at two objections: the claims that the conjecture fails to deal with all Gettier cases and that the Gettier Problem is a philosophical ‘dead end.’ In Section 4 I offer further support for the conjecture by situating it within a knowledge-first framework.