Beyond the Veil (Prequel Novella to the Prelude of Fire) by Christine E Schulze:
 
When she falls for a man from a forbidden kingdom, will her magical gift betray her heart?

Gillian of Adelar has spent her whole life stuck behind her society’s walls. Fed up with her horrible and forced betrothal, the young woman’s only solace for the lonely song buried in her soul lies in her people’s few surviving artifacts. Needing an escape, she steps through an outlawed enchanted veil…and meets a handsome knight riding a majestic, gemstone-eyed eagle.

After returning home with only his secret letters to keep her newfound passion alive, Gillian fears the prejudices between their realms could mean a violent end to their off-limits love.

Can their desires defeat a poisoned history and sing a happily ever after?