In "The Adventure of Black Peter," Sherlock Holmes and Dr. Watson are called to investigate the brutal murder of Captain Peter Carey, known as "Black Peter," aboard his ship, the Sea Unicorn. With a harpoon as the murder weapon and a series of cryptic clues left behind, Holmes must unravel the tangled web of suspects and motives. As the investigation unfolds, Holmes employs his keen powers of observation and deduction to uncover the truth behind Black Peter's demise, leading to a dramatic confrontation and the revelation of a cunning murderer's identity. "The Adventure of Black Peter" is a gripping tale of betrayal, revenge, and the relentless pursuit of justice on the high seas.