The Unspeakable Unknown - Hardcover

"In this sequel to A Problematic Paradox, out-of-school adventures open up opportunities for deepening the lore of the worldbuilding and introduce the idea of a horrific new antagonist. They also allow the text to broach uncomfortable (in a good way) discussions on sources of privilege and murky loyalties, both artfully enough to avoid bogging down the action-oriented plots--which introduce new friends and foes and extensively progress storylines left over from the first book (namely, the fate of Nikola's father and the identity of the traitor at the school). The well-developed denouement provides solid closure while plot tentacles set up the next story. Lots of fun, packing both wacky humor and meaningful plot movement." --Kirkus Reviews "Sappingfield layers some nuance into his well-built, wacky sci-fi world . . . [and] balances it all with plenty of humor, dishing up inventive sci-fi fare with a whopping side of silliness." --The Horn Book

Nikola Kross has battled aliens and won. But her father, who was kidnapped by evil extra-terrestrials, is still missing, and now it's up to Nikola and her friends to find and rescue him before its too late. He could be anywhere in the known universe, and they have little to go on except a desperate secret communication - "Kindly rescue me at your earliest convenience" - and an unhelpful clue that he's in a secure facility somewhere deep underground. But the extra-terrestrials are still determined to capture Nikola. And if she gets abducted, she won't have to wonder where her father is...because she'll already be there. In this funny and exciting sequel, Nikola and her friends discover new and unexpected allies and come face-to-face with a strange and mysterious enemy, one so powerful and so dangerous, they dare not speak his name.