We investigate the discourse structure of Free Indirect Discourse passages in narratives. We argue that Free Indirect Discourse reports consist of two separate propositional discourse units: an (explicit or implicit) frame segment and a reported content. These segments are connected at the level of discourse structure by a non-veridical, subordinating discourse relation of Attribution, familiar from recent SDRT analyses of indirect discourse constructions in natural conversation (Hunter, 2016). We conducted an experiment to detect the covert presence of a subordinating frame segment based on its effects on pronoun resolution. We compared (unframed) Free Indirect Discourse with overtly framed Indirect Discourse and a non-reportative segment....