Indigo is the rich, electrifying history of a precious dye: its relationship to the trans-Atlantic slave trade, its profound influence on fashion, and its spiritual significance - all very much alive today. But it is also the story of a personal quest: Catherine McKinley's ancestors include a clan of Scots who wore indigo tartan, several generations of Jewish 'rag traders' and Massachusetts textile factory owners, and African slaves who were traded along the same Saharan routes as indigo. Her journey takes her to nine West African countries and is resplendent with powerful lessons of heritage and history which shape the way she understands her world at home.