The main frame story concerns Shahryār, whom the narrator calls a "Sasanian king" ruling in "India and China".[8] Shahryār is shocked to learn that his brother's wife is unfaithful. Discovering that his own wife's infidelity has been even more flagrant, he has her killed. In his bitterness and grief, he decides that all women are the same. Shahryār begins to marry a succession of virgins only to execute each one the next morning, before she has a chance to dishonor him.
Eventually the Vizier (Wazir), whose duty it is to provide them, cannot find any more virgins. Scheherazade, the vizier's daughter, offers herself as the next bride and her father reluctantly agrees. On the night of their marriage, Scheherazade begins to tell the king a tale, but does not end it. The king, curious about how the story ends, is thus forced to postpone her execution in order to hear the conclusion. The next night, as soon as she finishes the tale, she begins another one, and the king, eager to hear the conclusion of that tale as well, postpones her execution once again. This goes on for one thousand and one nights, hence the name.
The tales vary widely: they include historical tales, love stories, tragedies, comedies, poems, burlesques, and various forms of erotica. Numerous stories depict jinn, ghouls, ape people, sorcerers, magicians, and legendary places, which are often intermingled with real people and geography, not always rationally. Common protagonists include the historical Abbasid caliph Harun al-Rashid, his Grand Vizier, Jafar al-Barmaki, and the famous poet Abu Nuwas, despite the fact that these figures lived some 200 years after the fall of the Sassanid Empire, in which the frame tale of Scheherazade is set. Sometimes a character in Scheherazade's tale will begin telling other characters a story of their own, and that story may have another one told within it, resulting in a richly layered narrative texture.
Versions differ, at least in detail, as to final endings (in some Scheherazade asks for a pardon, in some the king sees their children and decides not to execute his wife, in some other things happen that make the king distracted) but they all end with the king giving his wife a pardon and sparing her life.
The narrator's standards for what constitutes a cliffhanger seem broader than in modern literature. While in many cases a story is cut off with the hero in danger of losing their life or another kind of deep trouble, in some parts of the full text Scheherazade stops her narration in the middle of an exposition of abstract philosophical principles or complex points of Islamic philosophy, and in one case during a detailed description of human anatomy according to Galen—and in all of these cases she turns out to be justified in her belief that the king's curiosity about the sequel would buy her another day of life.
A number of stories within the One Thousand and One Nights also feature science fiction elements. One example is "The Adventures of Bulukiya", where the protagonist Bulukiya's quest for the herb of immortality leads him to explore the seas, journey to the Garden of Eden and to Jahannam, and travel across the cosmos to different worlds much larger than his own world, anticipating elements of galactic science fiction;[9] along the way, he encounters societies of jinns,[10] mermaids, talking serpents, talking trees, and other forms of life.[9] In another Arabian Nights tale, the protagonist Abdullah the Fisherman gains the ability to breathe underwater and discovers an underwater submarine society that is portrayed as an inverted reflection of society on land, in that the underwater society follows a form of primitive communism where concepts like money and clothing do not exist. Other Arabian Nights tales deal with lost ancient technologies, advanced ancient civilizations that went astray, and catastrophes which overwhelmed them.[11] "The City of Brass" features a group of travellers on an archaeological expedition[12] across the Sahara to find an ancient lost city and attempt to recover a brass vessel that Solomon once used to trap a jinn,[13] and, along the way, encounter a mummified queen, petrified inhabitants,[14] life-like humanoid robots and automata, seductive marionettes dancing without strings,[15] and a brass horseman robot who directs the party towards the ancient city. "The Ebony Horse" features a robot[16] in the form of a flying mechanical horse controlled using keys that could fly into outer space and towards the Sun,[17] while the "Third Qalandar's Tale" also features a robot in the form of an uncanny boatman.[16] "The City of Brass" and "The Ebony Horse" can be considered early examples of proto-science fiction.[18]
