In 'Herald of a Restless World,' Emily Herring explores the rise and fall of philosopher Henri Bergson's fame in the early 20th century. Bergson's ideas about time and human existence captivated audiences, but his fame eventually faded. Herring delves into Bergson's life and work, shedding light on his impact on philosophy and the reasons behind his decline in popularity. The biography offers a fascinating look at a philosopher who was once hailed as a favorite of the salons but is now largely forgotten.