The Burden is a novel written by Agatha Christie and first published in the UK by Heinemann on 12 November 1956. Initially not published in the US, it was later issued as a paperback by Dell Publishing in September 1963. It was the last of six novels Christie wrote under the nom-de-plume Mary Westmacott.When Laura Franklin's younger sister Shirley comes into the world, Laura instantly resents her, and soon begins to wish and even pray that her baby sister will die. But after saving Shirley's life in a fire, she experiences a complete change of feeling, and becomes very affectionate and protective towards her. Later, as the sisters grow up and fall in love, Laura begins to realise that the burden of her love for Shirley has had a dramatic effect on both their lives.