"Master Keaton" centers on Taichi Hiraga-Keaton, a half-Japanese, half-British insurance investigator with a diverse background in archaeology, survival skills, and military training. Keaton works for Lloyd's of London, often traveling across Europe to investigate insurance claims, solve mysteries, and uncover fraud. His expertise in survival tactics and his sharp intellect make him uniquely suited to handle complex and dangerous cases. The series is episodic, with each episode presenting a self-contained story that showcases Keaton's problem-solving abilities and his encounters with various individuals and situations.

Keaton's past as a former SAS officer and his academic pursuits in archaeology frequently intersect with his investigations, adding depth to his character and the narrative. His calm demeanor, resourcefulness, and moral integrity are central to his approach, whether he is negotiating with criminals, rescuing hostages, or uncovering historical secrets. The series also explores Keaton's personal life, including his relationships with his estranged wife and daughter, providing a humanizing contrast to his professional exploits.

The supporting cast includes recurring characters such as Keaton's father, a renowned zoologist, and his daughter, who occasionally becomes involved in his adventures. The series balances action, mystery, and drama, often delving into themes of human nature, cultural differences, and historical significance. Each episode is grounded in realism, with meticulous attention to detail in its portrayal of locations, historical contexts, and investigative procedures. The narrative structure allows for a wide range of storytelling, from tense thrillers to poignant character-driven moments, making "Master Keaton" a multifaceted exploration of its protagonist's life and work.