The Conspiracy of Magic

The Conspiracy of Magic by Harriet Whitehorn
 
In a world where magic is so powerful it has been outlawed, a brave young girl named Cass is a rare "obtuse," someone completely unaffected by magic. What has always felt like a handicap becomes her greatest strength when sinister sorcerers begin to perform malicious magical deceptions. It's up to Cass to protect the Queen of Minaris, but how can she defeat a powerful magician with no powers of her own? This rich fantasy adventure is a thrilling tale of bravery and ingenuity, perfect for fans of Cogheart and Nevermoor.