The Firehouse Restaurant in Old Sac will begin selling its first “house” wine this month: a $135 bottle of Cabernet Sauvignon made from a blend of California cult wines. The restaurant’s wine director, Mario Ortiz, and its sommelier, Paul Marsh, spent a year creating The Firehouse No. 3 2007 Cabernet Sauvignon, a proprietary blend of Cab Sauv, Cab Franc, Merlot and Petit Verdot. Six of the seven wines that make up the supersecret blend are so-called “cult wines”—expensive, limited-production wines that are highly prized by collectors. When I met with them, Ortiz and Marsh refused to name the wines, but they did drop a hint: All are represented on The Firehouse’s impressive wine list. Fishing for info, I threw out a name: Screaming Eagle? No, said Marsh with an enigmatic smile, “but it might be a neighbor.” Hmm. Could The Firehouse No. 3 inspire a guessing game for local oenophiles? “That would be great,” said Marsh.