Strange and terrible things begin to happen to four teenagers - all born on the same Valentine's Day. One of these teenagers is the Valentine- a Seelie fairy changeling swapped for a human child at its birth. The Unseelie have come to kill the Valentine - except they don't know who it is. Pearl shares a birthday with Finn Blacklin. She's known him all her life and disliked every second of it. Now Pearl and Finn must work together to protect themselves from the sinister forces that are seeking them out. But there's one more problem- the explosive chemistry between them . . .