Read This! Seraphina by Rachel Hartman
Humans and dragons engineered a fragile peace nearly forty years ago, but as the anniversary of the treaty nears, tensions escalate with covert factions on both sides instigating war. Seraphina, an unusually gifted musician, hides not only the extent of her talent but her heritage. Dragons can assume human form and a few live among the people of Goerdd as ambassadors and scholars; they are mathematical, rational and precise musicians, but they disdain emotion. Seraphina is half-dragon and half-human, something that everyone else presumes impossible. She must hide her true nature at risk of death for herself and her father, but her knowledge of dragons is uncanny. When the Crown Prince is murdered, Princess Glisselda and her betrothed, Prince Lucien rely on Seraphina’s courage and knowledge, drawing her deeper into an intrigue rooted in treason.
Vivid world-building at its best, Seraphina is an adventure that tests the boundaries of love, loyalty and what it means to be human.