From the back cover:
"The letters of the infernal Screwtape, a senior devil from a highly organized, computerized Hell, deftly instructs his nephew Wormwood, a junior demon, in the artof winning over a young man's soul -- not by a sudden fall into mortal sin, but by the routine and undramatic temptations of daily life.
"The Screwtape Letters takes us into a world that is immediate, familiar, and amusing, and so exposes the true nature of evil. . . and the very real devils in all our lives."
Lewis, through the fictional demon Screwtape, dryly skewers the vanities of mortal men, Christians and non-Christians, while exposing chinks in the spiritual armor and methods of both men and God, aka "the Enemy".
A must-read for anyone who's interested in Christianity, or just looking for a worthwhile satire. My only nit about this effective, word-taut work is that near the end of the 93-page novella Lewis/Screwtape begins to repeat his clever observations, albeit in a different form. A few chapters could've easily been trimmed from this; that said, this is one of my all-time favorite satirical works.
Check it out.
Followed by Screwtape Proposes a Toast.