This is thought to be Christie's semi-autobiographical account.
Blurb:
Bereft of the three people she has held most dear - her mother, her husband and her daughter - Celia is on the verge of suicide, then one nigh ton an exotic island she meets Larraby, a successful portrait painter, and through a long night of talk reveals how she is afraid to commit herself to a second chance of happiness with another person, yet is not brave enough to face life alone. Can Larraby help Celia come to terms with the past or will they part, her outcome still uncertain.