A rich woman and a calculating insurance agent plot to kill her unsuspecting husband after he signs a double indemnity policy. Against a backdrop of distinctly Californian settings, the partners in crime plan the perfect murder to collect the insurance, which pays double if the death is accidental.

Ten strangers are summoned to a remote island and while they are waiting for the mysterious host to appear, a recording levels serious accusations at each of the guests. Soon they start being murdered, one by one. As the survivors try to keep their wits, they reach a disturbing conclusion: one of them must be the killer.

Norwegian immigrant Marta Hanson keeps a firm but loving hand on her household of four children, a devoted husband and a highly-educated lodger who reads great literature to the family every evening. Through financial crises, illnesses and the small triumphs of everyday life, Marta maintains her optimism and sense of humor, traits she passes on to her aspiring-author daughter, Katrin.