Riddle of The Third Mile

By the 16th of July the Master of Lonsdale was concerned, but not yet worried. Dr Browne-Smith had passed through the porter's lodge at approximately 8.15 a.m. on the morning of Friday, 11th July. And nobody had heard from him since. Plenty of time to disappear, thought Morse. And plenty of time, too, for someone to commit murder...  Book 6 of series.