"A book that makes you sad"
This book made me cry my eyes out. I can't even remember what the plot was about, what I can remember was how much it made me cry. My mum and I were both reading James Patterson's Alex Cross series at the time and we were both amazed that he'd written a weepy woman's romance.
I have a memory of my mum reading it first and telling me I will go through a pack of tissues. I took it on holiday with us that year and read it on the plane, and I did cry my eyes out.