From the Music Theatre International website:
Set in 1900 Sweden, A Little Night Music explores the tangled web of affairs centered around actress Desirée Armfeldt and the men who love her: a lawyer by the name of Fredrik Egerman and the Count Carl-Magnus Malcom. When the traveling actress performs in Fredrik's town, the estranged lovers' passion rekindles. This strikes a flurry of jealousy and suspicion between Desirée, Fredrik, Fredrick's wife, Anne, Desirée's current lover, the Count, and the Count's wife, Charlotte. Both men -- as well as their jealous wives -- agree to join Desirée and her family for a weekend in the country at Desirée's mother's estate. With everyone in one place, infinite possibilities of new romances and second chances bring endless surprises.