14.  Indigo: In Search of the Color that Seduced the World, by Catherine E. McKinley

This book is way more down my line than the historical fiction one about the indigo plantation owner.  I really enjoyed my time with it.  The author earned a grant to explore indigo in Africa in about 2000, and I think this book was published about ten years later. She tells about her fascination with indigo,  some of its history and what remains of its place today, her travels, and her friendship with a local shop owner.