This is how a novella should be! lol a middle story that will give us some insight to the next book. 
 This is about a young lunar boy named Ze'er Kelsey who gets chosen for the Lunar Queen's Special Army, you find out how they are modifying the soldiers and how they are being trained. You also get to learn the hierachy of the "packs". Dont want to give too much away, but i believe that this will be helpful in reading Scarlet, which im starting soon :)