The Silent Barrier

In this engaging audiobook, Charles K. Spencer, a prosperous young American mining engineer, becomes intrigued by a chance encounter in a London hotel where he overhears two women discussing a trip to Switzerland. Taking on the role of "fairy godfather," he resolves to send one of them for career advancement in writing for a scientific journal. However, as their journey unfolds, Spencer becomes suspicious of the enigmatic Mr. Bower, who seems to be shadowing the young woman, prompting him to follow them to ensure her safety.