The Thornbird, also known as The Thornbird Trilogy, is a series of novels written by Australian author Kate O'Hara. The first book in the trilogy, titled "The Thornbird," was published in 1977. It tells the story of Meggie O'Malley, a young woman from a poor Irish family, and Vorian Atwater, a wealthy and mysterious man who becomes her lover and husband.

Set against the backdrop of 19th-century Ireland and Australia, the novel explores themes of love, passion, and the complexities of human relationships. Meggie's journey from a sheltered life in Ireland to the wilds of Australia is marked by her encounter with Vorian Atwater. Their relationship is filled with both joy and pain as they navigate through societal expectations and personal desires.

The story delves into the character's inner struggles and their search for identity and purpose. Meggie's growth from a naive young girl to a strong-willed woman is central to the narrative. Her experiences with Vorian lead her to question her beliefs and values, ultimately shaping her into someone more resilient and independent.

"The Thornbird" received critical acclaim for its vivid portrayal of characters and settings. It has been translated into numerous languages and adapted into both a stage play and an Academy Award-winning film directed by Ken Russell in 1983.

The subsequent books in the trilogy continue to explore the lives of Meggie and Vorian as well as their children, further unraveling the intricate web of their lives intertwined with politics, religion, and personal destinies.

In summary, "The Thornbird" is not just a tale of romance but also a profound exploration of human nature set against historical contexts that shaped the lives of its characters.