While no book on the subject could be exhaustive, The Bathhouse at Midnight does describe and assess all the literary sources of magic, witchcraft, astrology, alchemy, and divination from Kiev Rus and Imperial Russia, and to some extent Ukraine and Belorussia. Where possible, Ryan identifies the sources of the texts (usually Greek, Arabic, or West European) and makes parallels to other cultures, ranging from classical antiquity to Finnic. He finds that Russia shares most of its magic and divination with the rest of Europe.

Subjects covered include the Evil Eye, the Number of the Beast, omens, dreams, talismans and amulets, plants, gemstones, and other materials thought to possess magic properties. The first chapter gives a historical overview, and the final chapter summarizes the political, religious, and legal aspects of the history of magic in Russia. The author also provides translations of some key texts.

The Bathhouse at Midnight will be invaluable for anyone student, teacher, or general reader with an interest in Russia, magic, or the occult. It is unique in its field and is set to become the definitive study of Russian magic.