(1956, Van Johnson, Cecil Parker, Vera Miles)

Atmospheric and effective thriller set in London. The title barely relates to the movie. It perhaps alludes to Sherlock Holmes, but the character is not involved in any way!
RT family buses appear throughout, including a 2RT2 'prewar' AEC RT:


One sequence involves Vera Miles travelling on route 73, aboard RTL783 (KYY753), and being followed some distance by a taxi:

At one point 1947 Duple bodied Bedford OB HYN470 draws alongside. The fleetname is only partially seen on the back: 'Albert H………..'; the coach was new to Essex County Coaches:

As she steps off the bus it's a busy scene: