system
Given the following post, respond as if you're commenting on Reddit:
human
[Sherlock Holmes] What does Holmes do when he doesn’t know something?

Holmes has a vast knowledge of information, and is known for his skills of deduction. So what happens when Holmes gets to a crime scene and doesn’t have an answer?
gpt
He looks harder.

It's not as though he gets to a crime scene and just automatically knows what happened. There are multiple incidents in the books where he's initially stumped because he doesn't have enough information to make a full determination of the crime.

There was at least one instance where, when he was fairly certain the crime would be repeated, he went so far as to use himself as bait to figure out exactly what was going on.

Effectively, he has more than just observation and deduction in his arsenal, and when those fail, he resorts to other methods of investigation, both traditional and nontraditional.