An Oxford academic is dead on a tour bus and none of the other passengers even took notice. The curious case leads back to Crevecoeur Hall, a vast, history-rich Oxford estate, and as it happens, the setting for much of Detective Sergeant Hathaway’s (Laurence Fox) youth. Hathaway reconnects with his past — and Scarlett Mortmaigne, the daughter of the estate’s owner. But is he also consorting with a main suspect?