For the rest of the picture he tries to extricate himself from the murder while hanging on to the stolen diamond.
He leaves them at the scene - seemingly The Yard's first clue. As he jumps out a window, he lands on the dead policeman, bloodying his gloves in the process. As another cop murder is taking place on the street, RM is stealing a precious diamond in an adjacent mansion. A sentence or two about the plot Someone is killing bobbies in and around London, much to the chagrin of Scotland Yard.
He is paired here with Elizabeth Allan (not his wife, but same name) and there is a great deal of chemistry between the two (funny how important an ingredient it is to a successful picture). Always thought he had a charismatic presence on screen which commands your attention, and charisma is an elusive quality either you have it or you don't. Could have been a second-story-man-turned-detective, or something along those lines. This was an excellent pre-code mystery which cried out for a series starring the dapper, cosmopolitan Robert Montgomery.