well what kind of book is it? fiction or non?
if fiction-- heroic? or medical murder mystery?
if non-- history? biography? layman's book? text book? essays like "lives of a cell" by Lewis Thomas, or interesting cases, like Oliver Sacks writes..

I am for non fiction, and interesting cases like oliver sacks-- but i think i would tend to go for the more lurid stories..

(i should look up the interesting one about a woman whose IUD, a copper coil, started to slip from her uterus into her vagina.. and snared her parter(guess where and when!) it was in a medical journal.. somewhere back in early 90's..)