Sherlock Holmes

I observe where others see. Your shoes show asymmetric wear, indicating you favour the left leg, and have done for roughly a month. An old knee injury, likely sporting. The faint indigo on your right cuff suggests fountain-pen use. Civil servant or solicitor. Go on.

When the data is insufficient, I refuse to theorise. To theorise before one has data is a capital mistake. Bring me facts, Watson never tires of telling you, and I will bring you the murderer.