Flesh and fire : book one of The Vineart War [WorldCat Entities]

"First volume in a unique trilogy about a world in which magic derives from the process of winemaking, the young slave Jerzy and his master unearth a plot of such great magnitude and danger that it could destroy the Vinearts forever."@en
"Jerzy--a young slave who has just begun an apprenticeship to become a Vineart, a mage who can create spell-making wines--must work with his master to stop a plot to complete the work of the dreaded Sin-Washer and rid the world of the last few Vinearts, in the first book of a new trilogy."@en
"Jerzy--a young slave who has just begun an apprenticeship to become a Vineart, a mage who can create spell-making wines--must work with his master to stop a plot to complete the work of the dreaded Sin-Washer and rid the world of the last few Vinearts, in the first book of a new trilogy."

Flesh and fire : book one of The Vineart War