"The Country Girls Trilogy" is a series of three novels written by Irish author Edna O'Brien. The trilogy includes "The Country Girls," "The Lonely Girl," and "Girls in Their Married Bliss." It follows the lives of two young women, Kate and Baba, as they navigate their upbringing in rural Ireland, their friendship, and their experiences in the city. The novels explore themes of love, betrayal, and the struggle for independence against the backdrop of a conservative society. O'Brien's writing is known for its lyrical style and deep emotional resonance, making the trilogy a significant work in contemporary Irish literature.