A resistance of witches

"Stubborn, plain-spoken and from an unimpressive family, Lydia Polk never expected to be accepted into the Royal Academy of Witches. Eight years later, with Hitler's army rampaging across Europe, the Witches of Britain have joined the war effort, and Lydia is key to the cause: she must use her magic to track down magical relics before Hitler -- known to be obsessively seeking the artifacts himself -- and his sycophants can. Then a Nazi witch infi...