In the novel "In Cold Blood," why does the text discuss the murders and reveal the identities of the perpetrators right in the beginning of the narrative?

It was a bitter cold saturday morning ,the young track star dressed for his daily five mile run

Read the excerpt. “this is a train-servicing station and we have to wait for a train.” he shakes his head. i smile. “it’d be nice if we could get one.” lauren mizock has revised her draft of “train tracks” to convey plot events using

Juanito. hey, don't leave yet. what type of work? and where? who do i see? hey, don't leave yet! the duende. (the duende stops and turns). be careful. danger. danger. (he exits.) —blanca flor, angel vigl read these lines from the play again, then rewrite them as they might appear in a novel. the answer is 'hey, don't leave yet," cried juanito. "what type of work? and where? who do i see? hey, don't leave yet! " the duende stopped and turned back to juanito. "be careful. danger," he warned. as he turned to leave, he repeated: "danger."