Disaster strikes the vineyards in Alsace. Vintners are tense and old grudges surface. The Winemaker Detective's reputation is on the line as he must find the cause before the late harvest starts.

Winter is in the air in Alsace and local customs are sowing trouble, piquing the curiosity of the famous winemaker from Bordeaux, Benjamin Cooker. While the wine expert and his assistant Virgile settle into their hotel in the old city of Colmar, distinguished vineyards are attacked. Is it revenge?

The plot thickens when estates with no apparent connection to one another suffer the same sabotage just days prior to the late harvest. All of Alsace is in turmoil, plunged in the grip of suspicion that traces its roots back to the darkest hours of the German occupation. As he crosses back and forth into Germany from the Alsace he thought he knew so well, Cooker discovers a land of superstition, rivalry, and jealousy. Between tastings of the celebrated wines, he is drawn into the lives and intrigues of the inhabitants.