Sixteen-year-old Deirdre Monaghan is a painfully shy but gifted musician. She's about to find out she's also a cloverhand, one who can see fairies. Deirdre finds herself infatuated with a mysterious boy who enters her ordinary suburban life, seemingly out of thin air. Trouble is, he turns out to be a gallowglass, a soulless fairy assassin. And she is his next target ...