The Screwtape Letters is a satirical

Satire

Satire is primarily a literary genre or form, although in practice it can also be found in the graphic and performing arts. In satire, vices, follies, abuses, and shortcomings are held up to ridicule, ideally with the intent of shaming individuals, and society itself, into improvement...

 Christian apologetics

Christian apologetics

Christian apologetics is a field of Christian theology that aims to present a rational basis for the Christian faith, defend the faith against objections, and expose the perceived flaws of other world views...

 novel written in epistolary style

Epistolary novel

An epistolary novel is a novel written as a series of documents. The usual form is letters, although diary entries, newspaper clippings and other documents are sometimes used. Recently, electronic "documents" such as recordings and radio, blogs, and e-mails have also come into use...

 by C. S. Lewis

C. S. Lewis

Clive Staples Lewis , commonly referred to as C. S. Lewis and known to his friends and family as "Jack", was a novelist, academic, medievalist, literary critic, essayist, lay theologian and Christian apologist from Belfast, Ireland...

, first published in book form in February 1942. The story takes the form of a series of letters from a senior demon

Demon

call - 1347 531 7769 for more infoIn Ancient Near Eastern religions as well as in the Abrahamic traditions, including ancient and medieval Christian demonology, a demon is considered an "unclean spirit" which may cause demonic possession, to be addressed with an act of exorcism...

, Screwtape, to his nephew, a junior "tempter" named Wormwood, so as to advise him on methods of securing the damnation of a British man, known only as "the Patient".
In The Screwtape Letters, C.S. Lewis provides a series of lessons in the importance of taking a deliberate role in living out Christian faith by portraying a typical human life, with all its temptations and failings, as seen from devils' viewpoints.