Fae games will change you . . . but their love will ruin you. At least, that's what my mother told me. My mother had three rules: 1. Never make a bargain with a fairy. 2. Never enter the Waywoods on a hunting day. 3. Never give the High Fae princes a reason to notice you. But even when I followed all the rules, the royal fae still took my family from me. So in one night I broke all three rules, and brought the kingdom to their knees.

In a kingdom where magic has been lost, Fia is a rare changeling, left behind by the wicked Fair Folk when they stole the High Queen's daughter and retreated behind the locked gates of Tír na nÓg. Most despise Fia's fae blood. But the queen raises her as a daughter and trains her to be a spy. Meanwhile, the real princess Eala is bound to Tír na nÓg, cursed to become a swan by day and only returning to her true form at night. When a hidden gate to the realm is discovered, Fia is tasked by the queen to retrieve the princess and break her curse.

Niamh Ó Conchobhair has never let herself long for more. The magic in her blood that lets her stitch emotions and memories into fabric is the same magic that will eventually kill her. Determined to spend the little time she has left guaranteeing a better life for her family, Niamh jumps at the chance to design the wardrobe for a royal wedding in the neighboring kingdom of Avaland.

A beautiful discovery outside the window of her underwater home prompts the reclusive E. to begin a correspondence with renowned scholar Henerey Clel. The letters they share are filled with passion, at first for their mutual interests, and then, inevitably, for each other. Together, they uncover a mystery from the unknown depths, destined to transform the underwater world they both equally fear and love. But by no mere coincidence, a seaquake destroys E.'s home, and she and Henerey vanish.

My father called them messengers. He once told me they walked among us and that somewhere in this dark and godless city, there shined a faint sliver of hope. I had only to look for the signs. Well, I’ve spent my whole life investigating the inexplicable and all I've found are the unsettling vestiges of iniquity—the evidence of another world shrouded by the obscure. Purgatory to some, where depravity hides in shadows, and girls like me are little more than delicious bites of temptation. Others call it Nightshade.