Two free Logos books:
https://www.logos.com/product/162595/ancient-christian-devotional-a-year-of-weekly-readings-lectionary-cycle-a
The Dialogue of the Seraphic Virgin Catherine of Siena
After providing an in-depth introduction on the study of mysticism, Algar Thorold provides the English translation of Catherine of Siena's Dialogue, a series of colloquies divided into four treatises: "A Treatise of Divine Providence," "A Treatise of Discretion," "A Treatise of Prayer," and "A Treatise of Obedience."
www.logos.com