The debutante - Kathleen Tessaro

Cate, an exile from New York is sent to help value the contents of a once grand Georgian house.
Working with Jack, a man with his own unsettling past, she finds a shoebox containing a pair of 1930s dancing shoes and, mysteriously, a photograph and a Tiffany bracelet.
Returning to London, rather than face the questions lingering in her own life, Cate immerses herself in piecing together the clues contained in the box to uncover a story: that of Irene Blythe and her sister Diana - two of the most famous debutantes of their generation.
She uncovers a tale of dark, addictive love, prompting Cate to confront her own secrets.
Can the truth about Baby Blythe's past change Cate's own ability to live and love again?