A sidhe forced to defend a kingdom that would see her dead.

A foreign lord searching for stolen relics, whose help comes at a price.

 A kingdom where no one’s word can be taken for granted.

A world slipping into darkness, and two powers either destined to save or destroy it.

In a secluded land ruled by mortals, thirteen sidhe warriors form the Sentinel Guard to defend the people from supernatural threats. In a secluded land ruled by mortals, thirteen sidhe warriors form the Sentinel Guard to defend the people from supernatural threats. On the autumnal equinox, a mysterious demon attacks Asteria and her father. An outburst of power leaves half the city leveled, her father dead, and the beast nowhere to be found. Among the cinders, her best friend turns her in to the authorities.

With the Sentinel Guard at capacity, the King of Blackthorne invokes the Ordeals, a series of duels against the kingdom’s immortal warriors. Unable to control her newfound power, Asteria must rely on Kallan, a foreign lord with abilities that mirror her own. But his help comes with a bargain: she must assist him in finding stolen relics whose power could change the fate of her kingdom.

When Asteria discovers his connection to the Sentinel who stood by while she was turned in, she begins to question whom their bargain truly serves. As chaos descends and deadly mists slip in, she is left questioning whether to trust the institution she has known her whole life or the strangers she just met.