In this article, the author explores the relationship between science and truth in forensic crime fiction by analysis of narrative and media-specific constituents of CSI: Crime Scene Investigation (2000-) and Patricia Cornwell's The Scarpetta Factor (2009). Despite the different media, both are found to establish a strong bond between science and truth, and readers/viewers are encouraged to assume that this also is the case in the external world. This article originally appeared in Clues: A Journal of Detection, Volume 30, Issue 1.