Brought up by the same parents, but born to two different mothers, Nathalie and David have grown up as brother and sister, and share a fierce loyalty. Their decision as adults to try to find their birth mothers is no straightforward matter. It affects, acutely and often painfully, their spouses and children, the people they work with, and, most poignantly, the two women who gave them up for adoption all those years ago.

Exploring her subject with inimitable imagination and humanity, the celebrated author of Marrying the Mistress and The Rector's Wife once again works her magic.