Steven Spurrier (ALAN RICKMAN) is a Brit living in Paris who runs a wine shop and obviously knows his way around fermented grapes. Yet, his store's only customer seems to be an American freeloader by the name of Maurice (DENNIS FARINA) who samples a lot but purchases little. He does, however, give Steven the idea to expand his planned wine competition to include the American varieties found in California's Napa Valley.
Accordingly, Steven heads there and visits many vineyards, including Chateau Montelena run by Jim Barrett (BILL PULLMAN). A former corporate man, his biggest concerns now are processing the best wine possible as well as trying to get his slacker adult son, Bo (CHRIS PINE), to find some sort of clarity in his life.
Bo's focus, however, is on vineyard intern Sam (RACHAEL TAYLOR) who's also drawn the interest of co-worker Gustavo Brambilia (FREDDY RODRIGUEZ). He's the son of a migrant worker who's cultivating his own wine and often pulls off a wine tasting hustle with Bo and local bartender Joe (ELIZA DUSHKU).
Jim initially wants nothing to do with Steven's contest, but facing mounting bills and increased competition from other vineyards, he must decide what's best for him and his business, all as Steven tries to assemble the best that California offers to put up against the more famous and revered French wines.