Barbara Taylor Bradford, the bestselling author whose 1979 novel “A Woman of Substance” sold 30 million copies worldwide and was adapted into a successful Channel 4 miniseries, died on Sunday. She was 91.

Bradford’s death was confirmed to the Associated Press by a spokesperson, who said she died at her home in New York City. No cause of death was provided.

The British-American novelist began her career as a journalist before beginning to pen novels in her 40s, often revolving around young women making a name for themselves in business after overcoming obstacles. In total, she wrote 40 books, all of which became bestsellers in the United Kingdom and United States.

“A Woman of Substance” marked her debut novel in 1979, and also her most successful. It sold over 30 million copies worldwide and was adapted into a three-part Channel 4 miniseries in 1984 starring Jenny Seagrove, Deborah Kerr, Barry Bostwick and Liam Neeson. Spanning the 20th century, the story follows Emma Harte, who goes from a teenage servant in Yorkshire to a retail magnate and is faced with deciding who should carry on her legacy.

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