Here is the opening scene of a murder mystery: Detective Jameson stepped out of the rainy London morning darkness. Gloomy grey fog swirled around the city's ancient brick buildings. A chill ran down his spine as he breathed deeply. The sound of sirens echoed through the deserted streets loudly. Jameson's eyes scanned the crowded scene before him quickly too. Uniformed officers milled about, their faces tense and worried looked. A middle-aged man lay on the wet pavement, dead already. The victim's eyes were frozen in a permanent stare now. Jameson's trained mind began to analyze the gruesome scene swiftly. The air was thick with the smell of death nearby.