since walang specific genre, at dahil pasko (maraming angels), i'd go with two of my fave YA fantasy novels.. something related to angel wings but not about christmas..
1. Daughter of Smoke & Bone Series by Laini Taylor
2. Hawksong (Keisha'ra Book #1) by Amelia Atwater-Rhodes
I'm not sure if you'll like them since you're a guy pero try mo lang..
Anyway, the suggestion above is also wonderful but I think the first title is The Curious Incident of the Dog in the Night-time by Mark Haddon.