C S Lewis:
The space trilogy (Out of the Silent Planet, Perelandra, That Hideous Strength)

Charles Williams:
All Hallows Eve, Many Dimensions, The Place of the Lion, The Greater Trumps, Descent into Hell, Shadows of Ecstacy.

Walker Percy:
Love in the Ruins, The Thanatos Syndrome, The Last Gentleman, The Second Coming.

Laurie Garrett:
The Coming Plague

Level 4:
Virus Hunter's of the CDC

Virus Hunter:
30 Years of Battling Hot Viruses

A Field Guide to Germs