The Champagne Conspiracy (Wine Country Mysteries, Bk. 7)

Welcome back to the Montgomery Estate Vineyard, where Lucie Montgomery and winemaker Quinn Santori have decided to bottle a sparkling champagne-like wine a week before Valentine's Day. But on the eve of a major snowstorm, Quinn's cousin Gino, patriarch of one of Napa's wine family dynasties, turns up demanding help in solving a long-ago family mystery that has its origins in Prohibition-era Washington, D.C., where bootlegging and blackmail, jazz and murder, went hand in hand. Before long Lucie realizes someone will go to any lengths to keep a century-old secret involving a scandalous presidential affair buried in the past. Can she learn the identity of the ruthless modern-day blackmailer determined to stop her before it's too late?