I don't often cry when reading books. I was reading the last book in Stephen King's Dark Tower series while flying this week, and tears were falling (as I sniffled into my mask.)

I was thinking of books that made me cry. Four others came to mind:
The Grapes of Wrath by John Steinbeck
The Road by Cormac McCarthy
Blackout/All Clear by Connie Willis
The Dog Stars by Peter Heller

What about you? What books made your eyes leak?