"So Long a Letter" is an epistolary novel that explores the life of a recently widowed woman in Senegal. Throughout the story, she reflects on her life, her marriage, her husband's second, younger wife, and the status of women in Senegalese society. The book delves into themes of polygamy, friendship, and the struggle for women's rights in a predominantly patriarchal society. It is a poignant examination of the personal and cultural conflicts faced by women in post-colonial Africa.

The novel revolves around the tragic story of a young Antillean woman who, through her diary entries, reveals the harrowing details of her life and marriage. After moving to Africa to be with her new husband, she finds herself isolated and trapped in a world of deception and disillusionment. Her husband's indifference and infidelity, coupled with her growing sense of alienation in a foreign land, lead her down a path of despair. The narrative unfolds as her diary is read by another woman, who empathizes with her struggles and reflects on the complexities of identity, belonging, and the painful legacy of colonialism.

The novel delves into the complexities of family dynamics and personal identity through the lens of an Israeli family facing the impending divorce of the elderly parents. As the estranged father returns from America to finalize the divorce, the reunion with his adult children and their mother in Israel brings to the surface long-simmering tensions, secrets, and unresolved emotional conflicts. Set against the backdrop of Passover, the narrative unfolds in a series of perspectives from each family member, revealing the intricate web of relationships and the individual struggles within the family unit. The story examines themes of love, betrayal, and the search for self amidst the trials of familial obligations and societal expectations.