Elements of Fiction
A Christmas Memory by Truman Capote
Mood is the emotions you feel when you're finished reading the story.
Tone is the emotions the writer feels as the story is being written.
The mood that you're left with after reading, is bittersweet. You're sad that his friend dies in the end, but you're happy that Buddy has those good memories to hold onto.
I believe the tone is also bittersweet.