Four sisters have become queens, rulers of all that Aerthlan’s two moons embrace. The last sister will forge her own path . . .   Signs and Seals   Raised on the magic-seeped Isle of Moon, Maeve is used to unusual powers—and the way they fuel the politics of her world. But when she discovers an ability to shape-shift at will, she knows who she wants to share it with first. Brody, the enigmatic, infuriating shifter-spy has always made time for Maeve. But it’s been almost two