Issahâ is a French-language book authored by Jean d'Argoun, published in 1997 by Maisnie Tredaniel. While specific thematic details are not provided in the available metadata, the work’s title and context suggest it may explore abstract or philosophical concepts related to light, identity, or existential themes. The book’s structure and publication history indicate it is intended as a narrative or reflective piece, though further analysis of its content would be required to confirm its exact focus.