C.S Lewis is not the apologist and writer you might assume, if Jason Baxter is right. Plato, Boethius and Dante mattered immensely to a man who felt more at home in the medieval world, and longed to inspire the modern world with a half-forgotten theophany.
His friend, Owen Barfield, also anticipated a transfigured today, one in which participation with divine life was known by ourselves and within the inside of the whole world.
Christianity itself would recover its experiential, mystical core, the friends hoped, and be less  eclipsed by credal and moral formulations.
In this conversation, Jason Baxter and Mark Vernon explore matters from Christian Platonism and the Incarnation, to the Eschaton and the strangeness of miracles. 
What might Lewis and Barfield have talked about in private? How closely are the soulmates' visions entwined? Why does Christianity need to recover its oddness and surprise, drawing on the past and being drawn by a renewed future?
Jason Baxter's book's include The Medieval Mind of C.S. Lewis, full details here - https://www.ivpress.com/the-medieval-mind-of-c-s-lewis.
Mark Vernon's books include A Secret History of Christianity on Owen Barfield, full details - here https://www.markvernon.com/books/a-secret-history-of-christianity