Seraphina by Rachel Hartmann is 1.99$ at amazon:
http://www.amazon.com/Seraphina-1-Ra.../dp/B005IQZC2M.
In the kingdom of Goredd, dragons and humans live and work side by side – while below the surface, tensions and hostility simmer.
The newest member of the royal court, a uniquely gifted musician named Seraphina, holds a deep secret of her own. One that she guards with all of her being.
When a member of the royal family is brutally murdered, Seraphina is drawn into the investigation alongside the dangerously perceptive—and dashing—Prince Lucien. But as the two uncover a sinister plot to destroy the wavering peace of the kingdom, Seraphina’s struggle to protect her secret becomes increasingly difficult… while its discovery could mean her very life.