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Tearjerker: The Outsiders
Johnny's death after the big rumbles, which causes Dallas to lose it and storm out and eventually rob a grocery store to attract the cops attention, then points an unloaded gun at them, knowing that they'd shoot.
Johnny's note that he left in Gone With the Windafter he dies.
Throughout the book, we never realize all Soda's going through until the final chapter, where he finally has a Heroic BSOD. Pony missing, Johnny and Dallas dead, Pony and Darry constantly fighting and him unable to take sides, and on top of all that, Sandy had somebody else's baby, and when Soda still wanted to marry her despite that, she left town and didn't answer his post.