Lamb tells the story of Maria and Ingvar, a childless couple of Icelandic sheep farmers in the early forties, and how an unexpected change in their circumstances brings them much joy before ultimately destroying them. 

After Inga loses her husband in a car accident, she must stand on her own two feet. She reckons with the past and the community in which she lives. 

When Gisella becomes bankrupt, she decides to rent out her spare bedrooms to two immigrant women. The arrangement begins well for all parties but gradually the foreign influences in the home begin to threaten Gisella's control of the house, her morals and her sanity.

A single woman in her late forties independently declares war on the heavy industry in her country. She turns to sabotage and is prepared to risk everything for nature and the untouched highlands… until an orphan from Bulgaria enters her life.