Historical Fiction:
* The Nightingale's Song: This novel, set in the 1940s, follows the story of two sisters navigating the horrors of World War II.
* The Secret Keeper: This novel explores the lives of two women who are brought together during a time of great upheaval in France.
* The Stolen Child: This novel delves into the secrets and long-held grievances of a family in Ireland.
* The Missing Wife: This novel is a suspenseful mystery about a woman who disappears, leaving her husband to unravel the truth.
* The Last Letter: This novel tells the story of a woman who finds a letter that reveals a long-buried secret about her family's past.
* The Forgotten Wife: This novel tells the story of a woman who wakes up in a hospital with no memory of her past, and must piece together the puzzle of her identity.
Contemporary Fiction:
* The Family Secret: This novel is a heartwarming story about a family who is reunited after many years apart.
* The Perfect Wife: This novel is a suspenseful thriller about a woman who is trapped in a marriage with a controlling husband.
* The Woman in the Window: This novel is a psychological thriller about a woman who witnesses a crime from her window.
* The Girl on the Train: This novel is a mystery about a woman who becomes obsessed with a couple she sees from her train window.
Nonfiction:
* The Art of Writing Historical Fiction: This book is a guide for aspiring writers on how to write historical fiction.
* The History of Ireland: This book is a comprehensive history of Ireland.
Please note: The specific books listed above might not be exhaustive, and Anne Duggan might have authored other works. It's recommended to check official sources like Goodreads or Amazon for a complete list.