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Tear Jerker: Warrior Cats: Power of Three
Virtually every book, until the third series.
...And then the third series hits us with Honeyfern's death.
How is the third series NOT a tear-jerker? It was arguably the most depressing of the three series, what with the killing, insanity, secrecy, and extreme "Break the Cutie" (ALL of the three protagonists).
This troper was reduced to tears several times. The most recent was when Squirrelflight got injured after the battle with RiverClan and WindClan, which limited my vocal abilities to "Not Squirrelflight...please, not Squirrelflight..." Thank StarClan she healed.
When Ashfur died, despite his unfortunate total psychotic breakdown.