She's had it forever. A tiny mark on her hand. No big deal, right? But when Tori discovers that her ordinary freckle is really some kind of microscopic tattoo, she doesn't know what to think, especially after meeting Eric, a guy she feels strangely connected to--and not just because he has a mark too. All too soon, Tori and Eric realize that their marks are only the first clue to a mystery that will change everything. And with each new discovery, Tori finds herself pulled deeper and deeper into a world she could never have imagined.