Royal bastards - Andrew Shvarts

Being a bastard blows. Tilla would know. Her father, Lord Kent of the Western Province, loved her as a child, but cast her aside as soon as he had trueborn children. At sixteen, Tilla spends her days exploring long-forgotten tunnels beneath the castle with her stablehand half brother, Jax, and her nights drinking with the servants, passing out on Jax's floor while her castle bedroom collects dust. Tilla secretly longs to sit by her father's side, enjoying feasts with the rest of the family. Instead, she sits at the Bastards' Table. But when Tilla and Jax is lead the visiting Princess Lyriana on a late-night escapade with their fellow bastards, they stumble upon a crime they were never meant to witness--a brutal coup. The group flees for their lives, relentlessly pursued by murderous mercenaries. The bastards band together, realizing they alone have the power to prevent a civil war that will tear their kingdom apart-if they can warn the king in time. And if they can survive the journey . . .