The prequel book released today!
https://www.amazon.com/Audible-Midnight-Suns-Infernal-Rising/dp/B0BFSS2K2V/ref=mp_s_a_1_1?crid=LKB4NWFMYQNH&keywords=midnight+suns+book&qid=1669867151&sprefix=midnight+suns+book%2Caps%2C183&sr=8-1