MURDER MYSTERY • FREE TRANSLATOR.ORG • Definition of Murder mystery

... wages from the start. From the comparatively easy work of watching or "locating," he is advanced through the more difficult varieties of "shadowing" and "trailing," until eventually he may develop into a first-class man who will be set to unravel a murder mystery or to "rope" a professional criminal. But with years of training the best material makes few real detectives, and the real detective remains in fact the man who sits at the mahogany desk in the central office and presses the row of ...

— Courts and Criminals • Arthur Train

... quickly over. "Mr. Burke and I are old friends," explained O'Connor. "We try to work together when we can, and very often the city department can give the government service a lift, and then again it's the other way - as it was in the trunk-murder mystery. Show Professor ...

— The Poisoned Pen • Arthur B. Reeve