Song of the Huntress by Lucy Holland

Britain, 60AD. Hoping to save her lover, her land, and her people from the Romans, Herla makes a desperate pact with the king of the Otherworld. But years pass unheeded in his realm, and she escapes to find everyone she loved long dead. Cursed to wield his blade, she becomes Lord of the Hunt. And for centuries, she rides, leading her immortal warriors and reaping wanderers’ souls. Until the night she meets a woman on a bloody battlefield—a Saxon queen with ice-blue eyes.

Queen Æthelburg of Wessex is a proven fighter. But when she leads her forces to disaster in battle, her husband’s court turns against her. Yet King Ine needs Æthel more than ever. Something dark and dangerous is at work in the Wessex court. His own brother seeks to usurp him. And their only hope is the magic in Ine’s bloodline that’s lain dormant since ancient days.

The moment she and Æthel meet, Herla knows it’s no coincidence. The dead kings are waking. The Otherworld seeks to rise, to bring the people of Britain under its dominion. And as Herla and Æthel grow closer, Herla must find her humanity—and a way to break the curse—before it’s too late.