State prisoners who file federal habeas corpus petitions face a maze of procedural and substantive restrictions that effectively prevent almost all prisoners from obtaining meaningful review of their convictions. But it is a mistake to think that habeas litigation is just a Kafkaesque nightmare with no constructive potential. Federal courts do sometimes cut through the doctrinal morass to consider state prisoners’ claims, relying on what this Articleterms equitable gateways to federal habeas relief. Litigants and courts generally underestimate the potential these gateways offer, with the result that habeas litigation does not focus on them as often as it should. Here I consider one important category of equitable gateways animated by a ...