The Heart of Rome. A Tale of the "Lost Water"

Under a Roman palace runs the Lost Water - an underground stream from the aqueducts - and above it a family is being sold up, a librarian is cataloguing what is left, and somebody is looking for what was hidden when the money went. Crawford lived above Sorrento and wrote more than forty books at a pace his publishers could not keep up with; the Rome under Rome in this one is real, and he had been down there.