Japanese-British author Kazuo Ishiguro's novel Never Let Me Go is set in a dystopian alternative world in which clones are raised to provide a supply of organs for non-clones. Kathy, the protagonist, and the main supporting characters of the novel, all grew up in a school called Hailsham, which was designed as a place to treat clones somewhat humanely.
The first piece of information that the clones are denied but then learn is that they are being raised as organ donors, expected when they mature to provide spare parts for non-clones, until they eventually die.
The next piece of information that they are denied and then that is revealed to them is that they are sterile, and that thus their sexual activities cannot result in pregnancy.
The next mystery is the use to which their art work and the mysterious Gallery are being put, namely to try to convince non-clones that clones have souls.
The main piece of essential information they lack and then gain is the knowledge that they have no purpose, no freedom, and no future. As they learn about normal life and fantasize about it, their teachers reveal, piecemeal, that each of the elements of the normal lives of ordinary people or characters that the students discover in films or books are actually unavailable to clones, and that they have no real purpose beyond being living collections of harvestable organs.