A story whose text is largely, if not solely, composed of multiple contemporary in-story documents to form the narrative. All the Narrator has done is put the supposedly pre-existing documents in order. This style of writing used to be commonplace, because of its inbuilt explanation of how the narrator knows so much, but had been largely superseded by the Victorian period. However, it is still sometimes used. The Epistolary Novel, which consists of letters sent by the characters to each other, is a subtrope of this. Both tropes provide an in-story justification for a Switching POV.