In this grim debut novel, the Doyles hide the terrible secret that 16-year-old Mackie is a changeling who was swapped for their real son when he was a baby. In their town of Gentry, there is an unspoken acknowledgment that a child is stolen every seven years in an uneasy bargain for the town's prosperity. Mackie's struggles to go unnoticed are made more difficult by his severe allergies to iron...