In the nineteenth century, seventeen year old Effi Briest is married to the older Baron von Instetten and moves into a house, that she believes has a ghost, in a small isolated Baltic town. She soon bears a daughter, Annie, and hires the lapsed Catholic Roswitha to look after her. Effi is lonely when her husband is away on business, so she spends time riding and walking along the shore with Major Crampas. Instetten is promoted to Ministerial Councillor and the family moves to Berlin, where Effi enjoys the social life. Six years later, the Baron is given letters from Crampas to Effi that convince him that they had an affair. He feels obliged to challenge Crampas to a duel and banish Effi from the house.

Berta, a naive young maid, searches for love when the army engineers come to town to build a bridge.