The "Illuminatus! Trilogy" is a series of three novels written by Robert Shea and Robert Anton Wilson, published between 1975 and 1998. The books blend elements of science fiction, conspiracy theory, and satire, exploring themes of power, control, and the nature of reality. The narrative is non-linear and features a wide array of characters, including members of the Illuminati, a secret society often associated with conspiracy theories. The trilogy consists of "The Eye in the Pyramid," "The Golden Apple," and "Leviathan." It incorporates various historical and fictional figures, such as H.L. Mencken and James Joyce, and draws on diverse influences, including occultism and counterculture movements. The work has gained a cult following and is noted for its complex structure and philosophical depth.