In Erik Larson's "Dead Wake: The Last Crossing of the Lusitania," Captain Hall is highlighted as a significant figure in the story of Room 40, which was involved in intelligence operations during World War I. Although Hall did not have direct control over this intelligence division in early 1915, his leadership and reputation became intertwined with the successes and developments of Room 40.

As the narrative unfolds, Hall's association with Room 40 reflects the broader themes of war intelligence and maritime security. His contributions, despite being separate from the operations of Room 40, helped establish a legacy that would define the effectiveness of intelligence work during a critical period in history.