"The Adventure of the Copper Beeches" involves Violet Hunter seeking Holmes' advice about a job offer with odd requirements. She's tasked with impersonating the former governess and following unusual instructions. Holmes investigates the estate's mysteries, discovering a captive child and a disturbed employer seeking to manipulate the child's appearance. Holmes exposes the employer's sinister intentions, ensuring the child's safety. The story ends with justice served, revealing the dark secrets hidden within the Copper Beeches estate and highlighting Holmes' determination to protect the vulnerable from exploitation and harm.