It's the person in the white coat, a physician with a stethoscope around their neck and a packed pocketful of paper notes and pens. The white coat instantly gets your attention. It's meant to quickly convey authority, and it does – so much so that you trust your very life to the person wearing it. In "Code Gray" by Farzon A. Nahvi, M.D., that white coat won't leave you in the dark.