What is the theme in Stiff: The Curious Lives of Human Cadavers by Mary Roach?

Dignity is another theme. While it is true that a human, like any animal, is composed of blood, tissue, and bone, there also exists a strong human imperative to dignify human remains. A cadaver is due respect by virtue of having been human. Roach does not disagree, but instead asks the question, "What does it mean to treat the dead with dignity?" While certain behaviors are obviously undignified, such as cannibalism or corpse snatching, others are less clearly defined. Is it undignified to raid a brain-dead corpse for its still functioning organs?