http://tvtropes.org/pmwiki/pmwiki.php/Tearjerker/Kidnapped
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Tear Jerker /
Kidnapped
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The book:
- Ransome's death.
- Alan and David saying goodbye at the end.
The series:
- Leopold's reunion with his family. His mom asks him if he's okay, and the way he responds "I don't know" is absolutely heartbreaking.