"The Seven-Percent Solution" is a novel by Nicholas Meyer that reimagines the relationship between Sherlock Holmes and Dr. John Watson. Set in the late 19th century, the story presents Holmes as a drug addict who seeks treatment for his addiction to cocaine. In the narrative, Holmes and Watson embark on an adventure that involves a plot against Sigmund Freud, who plays a significant role in the story. The title refers to Freud's theory that only seven percent of communication is verbal, emphasizing the importance of non-verbal cues in understanding human behavior.