In 1987, a rural Oregon fire investigator mapped a farmhouse blaze so meticulously that his hand-drawn diagrams became the sole evidence convicting a grieving father of arson and murder — diagrams that, thirty years later, a computational fire dynamics researcher would prove were physically impossible. Tonight, we follow the trail from a burned kitchen in Tillamook County to a university lab in Helsinki, and ask a question that should terrify anyone who's ever trusted an expert witness: what happens when the science was never science at all?