Opera Boston this season has made a big investment in stars, building two of its three productions around singers of international caliber. Last night in the Cutler Majestic Theatre, the curtain went up on Offenbach’s “La Grande-Duchesse de Gérolstein,’’ in a production expressly created for mezzo-soprano Stephanie Blythe. It all pulls together winningly. Offenbach’s score is masterfully featherweight entertainment, and with this cast, “La Grande-Duchesse’’ is easily one of the most enjoyable things the company has done in years.
The operetta, with a libretto by the same team (Meilhac and Halevy) that brought you the libretto to “Carmen,’’ is set in a fictional 18th century duchy in which trouble is afoot. The Grand-Duchess is coming of age and taking a mettlesome interest in the affairs of state, so her senior advisers concoct a war of distraction to keep her occupied. She knows nothing of war but finds the ritual splendor of military life to be the sweetest aphrodisiac and ultimately falls for Fritz, a simpleton private who, it turns out, is devoted to his equally humble girlfriend, Wanda, and oblivious to the Grand-Duchess’s advances. She even promotes him all the way up the military chain of command, rankling his former superiors to no end. An assassination plot is hatched but ultimately put aside. Fritz is allowed to marry Wanda, and the Grand-Duchess makes her peace with her obsequious suitor Prince Paul.