Ace of Blades

Farwyn Corvaella is an assassin, raised in blood and taught how to wield a dagger from a young age. She's killed both friend and foe to reach the top, but now she must pay the consequences. When an assassination attempt goes wrong she is taken to the king and forced to make a choice: serve him, or watch her friends die.
Aymar Larenor is the king's son, and heir to the Agarian Empire, but he is not proud of his heritage. Cursed with the power of magic since he was born, he struggles to control his power, even under the talented eye of his father's advisor. But when the terrifying prospect of marriage arises, Aymar's world comes crashing down and he makes the split decision to leave.
Soon, their destinies become intertwined as Farwyn finds herself alongside Erondur Aldervehn, a King's Guard with a mysterious past, and is sent to find and return her enemy's son, or watch her world come crashing down around her.