How did Capote build suspense despite the fact that readers know the ultimate outcome from the beginning of the book?

Truman Capote builds suspense in "In Cold Blood" by intricately detailing the backgrounds and motivations of both the Clutter family and the murderers, Perry Smith and Dick Hickock, allowing readers to become emotionally invested in their stories. He employs a non-linear narrative, shifting between the events leading up to the crime and the aftermath, which keeps readers engaged and anxious about how the inevitable outcome unfolds. Additionally, Capote's vivid descriptions and psychological insights create a sense of foreboding, compelling readers to confront the chilling realities of the characters' actions even when the conclusion is known.