I'll see your government secrets and I'll raise you a sweater

 My friend read half of Code Name Verity before I picked it up. Then she took a break while I read the entire thing. She asked me "Is it worth finishing?" I looked at her silently and nodded. I ccouldn't tell her anything about it. She already knew the plot. (Lady spy gets captured by Gestapo in France and starts spewing secrets to stay alive during WWII.) I can't say anything about it except this: If you ask me if it is worth reading, I will look at you silently and nod.