The Nightmare King — L.M. Mann

Andy and his sister, Leigh, must journey to The Land of Dreams to rescue Maggie from the dungeon of the Nightmare King. Along their quest, they are helped by creatures of myth and legend - Shadow, a huge black dragon; Sir Isaac, a fiercely beautiful eagle; and Prince Reginald, a mongoose of royal birth. With the help of their new friends, the children face their fears, conquer new challenges, and mount a daring rescue.