Double-Head (1927) is a bold narrative about stock-market manipulation, extrapolating the notion of technologically-aided telepathy while detailing a quest to rediscover the alchemists' fabled philosopher's stone. The novel is sufficiently innovative and intelligent to transcend its deliberately popular format, has considerable imaginative substance, and deserves to be reckoned a significant contribution to the genre. It is an interesting addendum to the literary career of Gaston Danville, one of the most intriguing dabblers in imaginative fiction to emerge during the turbulent fin-de-si�cle in France.