Re: How, in perfect detail, does cyanide poison work?

Essentially, cyanides bind covalently to heme groups to form nonfunctional cyanohemes. Heme is the functional end of both hemoglobin, which carries oxygen through the blood, and cytochrome c, which allows respiration in the mitochondria. By inhibiting these enzymes through the formation of cyanohemes, cyanide prevents the body from using oxygen, and the cells of the body suffocate. For further detail, I ran a PubMed search for Cyanides and found the following article that may add the depth you're looking for:

Chen YR, Deterding LJ, Tomer KB, and Mason RP (2000), "Nature of the inhibition of horseradish peroxidase and mitochondrial cytochrome c oxidase by cyanyl radical." Biochemistry 39 (15):4415-4422