This book is a super good read. It is popular history at its most entertaining. However, it is much more than that; it is a passionate plea for tolerance, and especially for religious tolerance. This is, of course, very timely, since the world today is sinking into the same religious hatreds that ruined Spain in the last centuries covered by this book.
For more than seven centuries, Christianity and Islam split the Iberian peninsula between them, with Jews forming a third major religious community. Sometimes there was "convivencia" (successful living-together); usually there was fighting, but at least there was mutual learning. Much of modern European civilization came from Islam, mostly via Spain--everything from the lute (al'ud in Arabic) to saffron (az-zafran) to the works of Aristotle and Galen, which survived largely in Arabic translations and had to be reintroduced to west Europe after the Dark Ages. For centuries, Spain was a vast, wide-open pipeline, siphoning civilization to the west. This story is repressed and hidden in too many standard histories.
I hope that Lowney's book gets many people interested in this amazing period of history. Readers will want to follow up by looking up the more serious literature. Excellent advanced histories and art studies are available. I would especially recommend the poetry: the unbelievably beautiful Spanish, Catalan and Galician lyrics that delighted the Christians, and the soaringly romantic or darkly brooding poems of the Arabic masters. (And there were, inevitably, even some poems written in both: Arabic poems with rather mangled Spanish verses interspersed.) Latin/Spanish and Arabic ideas of fine writing, as well as ideas of love and loss and beauty, cross-fertilized each other, producing some of the most musical sounds and dramatic images in all literature. Many excellent anthologies are available. Look them up on Amazon!