A folkloric collection of stories about saints from the Grishaverse. In no particular order, Bardugo presents 28 short and fantastical, fictional saint stories. Some read like origin stories, explaining why that saint is celebrated and for whom they are a patron. For example, Sankta Anastasia is named patron saint of the sick after saving her village from a plague by allowing the ill to drink her blood, which contained healing properties. Other stories, such as those of Sankt Valentin and Sankta Alina of the Fold, are specific accounts, with saints' offering glimpses into their influence and power over people's lives. The journey to sainthood for these colorful characters ranges from unjustly tragic (Sankta Lizabeta of the Roses was executed by quartering when she had no answers for a frustrated general), to humorously improbable (Sankt Lukin the Logical, patron saint of politicians, offers advice even after being beheaded). Presented without much context, these tales will primarily appeal to those already familiar with the Grisha series. The final entry, though, about the unnamed Saint of the Book, who cryptically advocates for these stories, may entice readers to fully enter the Grishaverse. Zollinger, an artist experienced in painting biblical and historical imagery, provides artistic dimension to these supplemental folktales with enchanting, full-color illustrations that evoke medieval books of hours. Ethnic diversity in the saints is implied by the artwork. An extra treat for invested Bardugo fans. (Fantasy. 12-adult) Copyright (c) Kirkus Reviews, used with permission.