A captivating cover illustration for a mystery deduction game in the style of Alphonse Mucha. The scene features a detective, a police officer, a female secretary, and a yakuza member, all elegantly posed with flowing lines and ornate patterns typical of Art Nouveau. The detective holds a magnifying glass, the police officer stands confidently, the female secretary has a notepad, and the yakuza member exhibits a stylish demeanor. The background includes intricate floral designs and a foggy cityscape, with the game title displayed in an elegant, decorative font at the top