Jade said:
-Alas Babylon (I cried when the fish died.. but only b/c of the way the little girl got treated for taking him.. she was being forced into a stereotypical role and I got pissed off).
Great book! I didn't cry, but I was scared to death for two months after I read that (I was twelve!). Two other great books in the same genre are "Malevil" (can't remember the author's name) and "Farnham's Freehold" by Robert Heinlien.