Carrie's War is an adaptation of a 1973 children's novel by Nina Bawden, set during the Second World War and following two evacuees, Carrie and her younger brother Nick.

A politician's wife and the mortician who has secretly loved her for years plan to fake her death so they can run away together.

The story covers eighty years in the lives of a pair of Welsh identical twins with an unusual bond, as they go through war, love affairs, and land disputes.