[Little Simon] In the third installment of the action-packed Guardians of Horsa graphic novel series, the Guardians take to the sky. There is a secret battle raging in the clouds high above the landlocked realm of Horsa. The Derecho Herd has long been under attack by an army of strange beasts known only as the Turbulence. But when the Guardians are called to help, they find that not everyone wants them around…especially when there are magical mysteries to be revealed.