In Sunreach, after a planet-destroying Delver suddenly appears in the sky of Detritus and vanishes just as suddenly, FM knows that the last free human society got lucky. Her Skyward Flight companion Spensa figured out how to draw this Delver away, but it won't be so easy next time. Humanity has to be prepared . . . In ReDawn, Alanik has recovered from the shock of answering a distress call and finding a planet of humans making a stand against the Superiority, only to be dismayed to discover they're considering a peace overture from their enemy. Worse, when she returns to her home planet of ReDawn, she find her own people falling into exactly the same trap. With her mentor captured, she turns to her new friends to help: can Alanik, FM, Jorgen and Rig coax an ancient technology into life in time to save both their planets from disaster?