Dead Man's Wine by Parker French 

Two dead men. Two mysterious lists. And a wine expert with a nose for trouble.

In Sonoma, California, the glamorous Flight of Fancy Charity Auction is only a week away, but when a counterfeiter of expensive wine is found dead with a mystifying list of numbers, circles and checkmarks in his pocket, wine expert Sarah McKee is called in to investigate. With prints on the murder weapon pointing to her friend, Zach Sullivan, Sarah must race against time to clear his name and uncover the truth behind the murders.

As Sarah follows the trail of clues, she is soon drawn into a counterfeit ring that will stop at nothing to protect their lucrative operation. With the stakes higher than ever, Sarah must use her knowledge of wine and her quick wits to expose the killers before the auction.