Finished Indian Summer. Not quite sure why it was in my collection of science books, but anyway,
Guy goes to Florence, meets old friend and younger room-mate. Room-mate becomes infatuated. Guy is like, "I'm in my 40's, you're in your 20's, but if you're sure, I guess we can try." Get engaged. Guy gets in accident. Girl figures out she doesn't love him, friend-zones instead. Guy marries old friend. Lots of human Romance stuff.