The idea for Sherlock Holmes first came to Sir Arthur when he was a medical student in Scotland. His professor Dr. Joseph Bell, described as a forensic genius, was able to diagnose patients' diseases. He observed in the patient interview. Sir Arthur had never seen this skill exhibited before, and it made a profound impression on him.
Later, when he was a doctor in England, and wasn’t a very successful . He began thinking about develop a detective character. His first love had always writing, and he had already published one novel and written another.