"The Thorn Birds" is a sweeping family saga that spans three generations of the Cleary family, set against the backdrop of the Australian outback. It focuses on the forbidden love between the beautiful Meggie Cleary and the family's priest, Father Ralph de Bricassart. The novel explores themes of love, religion, and ambition, as Meggie and Ralph struggle with their feelings for each other and the choices they must make.

The novel is a retelling of the Trojan War from the perspective of Cassandra, the doomed prophetess and daughter of Priam, the king of Troy. Through her eyes, we experience the final days of the legendary city and her own tragic fate. The narrative delves into themes of power, feminism, and the role of women in history and myth, as Cassandra reflects on her life, her prophetic gift that was both a blessing and a curse, and the events leading up to the city's downfall. Her internal monologue provides a poignant and introspective examination of human nature, war, and the often-unheard voices of women in the shadow of great historical narratives.

The novel follows the turbulent journey of an Australian man who travels to Ireland with his young daughter to reunite with his wife, only to discover upon arrival that she has mysteriously disappeared. As he searches across Europe for his missing wife, grappling with the uncertainty of her fate and the challenge of caring for his daughter alone, he is forced to confront his own shortcomings and the reality of his crumbling marriage. The narrative is a haunting exploration of hope, despair, and the complexities of love and identity, set against a backdrop of richly depicted landscapes that mirror the protagonist's inner turmoil.