I'm writing something—a story to be exact—and I am looking for a word which means "the top of a person's head." I remember seeing a word in which its meaning is exactly this one from a book that I'd read—Crispin: The Cross of Lead. I think it was something like "tope", but I looked at its meaning and it did not match.
Can anyone help me? I don't have the book with me because I just borrowed it at my previous school.