One fae assassin. One world divided, and her most dangerous assignment yet. Centuries ago, the people of Lycon were divided into two sides: solar and lunar. The fae remained separated, though lived in peace in recent years, until someone decided to change things up. As the solar realm's top assassin, Rian is tasked with investigating the lunar fae presumed to be responsible for poisoning their land. But when her mission takes her across the border into enemy lands, she finds herself tossed into the middle of more than she ever bargained for. Rivals become allies as Rian's path becomes entangled with creatures and fae she long assumed dead. Now she must figure out the truth before it's too late to save her home. With each decision she makes, it's a fine line between her success and her demise.