I t is 1483 and 10-year-old John Collan is living on a farm outside Oxford with his father, Will, and waging war on an aggressive goat that keeps trampling him. His mother is long dead and his older twin brothers, Oliver and Tom, have left home to begin apprenticeships. One morning John overhears the dairy maid Jennot discussing how Edward Plantagenet and his younger brother Richard, sons of the late King Edward IV, have been imprisoned in the Tower of London by their uncle Richard, Duke of Gloucester. Later, a well-dressed man arrives on a chestnut horse for a meeting with his father. John learns that the man is his benefactor who has paid for him to be tutored. “A bright future!” Will tells his son. “But secret for now.” A dramatic imagining of the true story of the royal impostor Lambert Simnel, Jo Harkin’s novel tells of a farmboy who is told that he is Edward V, 17th Earl of Warwick, rightful heir to the English throne and the elder prince in the tower.…