"Gnosis on the Silk Road: Gnostic Parables, Hymns, and Prayers from Central Asia" by Han-Joachim Klimkeit is a 512-page hardcover book published by HarperCollins in 1994. The book explores the religious beliefs and practices of Central Asia through a collection of Gnostic parables, hymns, and prayers. Illustrated with images, this book delves into the philosophy and spirituality of the region, offering a unique insight into the religious traditions of the area. Written in English, it is a valuable resource for those interested in the history and culture of Central Asia.