“Someday, maybe, Scout can thank him for covering her up.”
“Thank who?” I asked.
“Boo Radley. You were so busy looking at the fire you didn’t know it when he put the blanket around you.”
My stomach turned to water and I nearly threw up when Jem held out the blanket and crept toward me. “He sneaked out of the house – turn ’round – sneaked up, an’ went like this!”

– Harper Lee

To Kill a Mockingbird, Chapter 8. After the fire at Miss Maudie’s house, Jem, Scout and Atticus are drinking hot chocolate in their kitchen when Atticus refers to the blanket that Scout is wrapped in. She is shocked to learn it was the mysterious Boo Radley who sneaked out of the house and put it on her in an act of kindness and friendship.