God: A Human History
Reza Aslan's God: A Human History is an excellent introduction into the development and evolution of one of humankind's deepest and oldest subjects: God. Aslan's analysis and deconstruction of humanity's continuing reinvention of the idea of God is at once accessible and illuminating. I highly recommend this short read (and this author) to anyone interested in the mythical origins and evolution of God which have resulted in the vast array of contemporary interpretations.
Why Buddhism is True
Robert Wright's Why Buddhism is True is is a wonderful exploration into the practices of modern Buddhism. Wright departs from much of the mysticism and myth of Buddhism and focuses on a secular, science-friendly interpretation of the ancient buddhist wisdom. A great read for anyone interested in spirituality, meditation and applying a modern framework to eastern religious practice.
The Art Instinct
What is art? And how did we evolve into the creative creatures who produce it? The Art Instinct by Denis Dutton provides a thorough investigation into our ancient past in order to decode a Darwinian understanding of where our instinct for communication through art comes from.