C S Lewis completed Letters to Malcolm about 6 months before he died. It consists of 22 letters from Lewis to an imaginary friend (Malcolm) mainly on the subject of prayer. I have read this book several times and will do so again, because it is vintage Lewis. He manages to combine abilities, which are not usually found together. So he is the out-and-out supernaturalist, the committed believer, with a baptised, almost mystical imagination but also with a mind as sharp as a razor. So, for example on Page 120 we read:
"you, in your last letter, seemed to hint that there too much of the supernatural in my position; especially in the sense that "the next world" loomed so large. But how can it loom less than large if is believed in at all?"
And as with his other works, Lewis manages to pack a lot of depth into a very small space (the paperback is less than 125 pages long). For example, Letter V discusses the Lord's Prayer in just 5 pages. Yet I find a richness of meaning in those few pages, which mean that I keep coming back to them.
All things considered, I agree with the reviewer in the Church Times in January 1964 who wrote:
"With the death of C S Lewis, a glory departed. But regret must then immediately give place to gratitude for so generous a legacy as this. Here is a book... as good as anything he ever wrote... It is splendid, glorious stuff, the product of a luminous and original mind, tough and honest... and yet endowed with an extraordinary sensitivity and tenderness for the fears and foibles of men."