Summary from Barnes and Noble
Griffin Penshine is always making wishes. But when a sinister old woman tricks her into accepting a box of eleven shiny Indian Head pennies from 1897, Griffin soon learns these are no ordinary pennies, but stolen wishes.
This box of labeled pennies comes with a horrible curse: People in possession of the stolen coins are Wish Stealers, who will never have their wishes granted.... In fact, the opposite of what they've wished for will happen. Griffin must find a way to return these stolen wishes and undo the curse if her own wishes are to come true.
But how can Griffin return wishes to strangers who might not even be alive? Her journey leads her to ancient alchemists, Macbeth's witches, and a chance to help people in ways she never imagined, but the temptation of the Wish Stealers' dark and compelling power is growing stronger. Can Griffin reverse the curse in time to save herself and the people she loves?