Tropes present in The Book of the Still include:
- Body Horror: The eventual fate of the henchmen. See Timey-Wimey Ball below.
- Book Ends: An interesting framing device is created by writing the epilogue first, where Carmodi explains her actions and motivations to the reader, none of which make sense (not even the reason for reversing the order of prologue and epilogue) until the prologue at the end of the book.
- Cold-Blooded Torture
- Idiot Ball: Why on earth Fitz would volunteer for a thinly veiled sex slave ring is beyond most readers, though it could just be because he's Fitz.
- Lotus-Eater Machine: One is created for Fitz to make him fall in love with Carmodi, the woman who's payed for his services for twenty-four hours. Little did he know she'd kidnap him.
- Plucky Girl: Rhian Salmond.
- Timey-Wimey Ball: The three minions get somehow merged together when physics goes out to lunch near the end of the book, but don't manage to separate themselves before reality reasserts itself. The resultant terrifying monster evolves over time into an entire species: The Unnoticed, who have been chasing Carmodi and the Book of the Still the whole time.
- Fairy Tale Wedding Dress: Worn by Fitz of all people.
- What Happened to the Mouse?: Rhian and Carmodi's fates are ambiguous at best, and they count as examples because when the Doctor, Fitz and Anji leave, the two women get little to no explanation.