This is not a typical John Appleby book, in the sense that he appears mainly in the role of a concerned father. It is, in fact, his son, Bobby, who becomes involved in a mystery when an early morning round of golf leads him to the discovery of a dead body. Before he can gather his thoughts, including a vague feeling that the victim's hand, which is missing a finger, is familiar to him, a pretty girl appears and urges him to call the police. When Bobby returns to the golf bunker with the police in tow, both body and girl have disappeared, and the sand has been neatly raked around his golf ball.
This makes Bobby, if not a suspect, at least someone who is getting caught in the police machinery. So he sets out to do a spot of independent investigating, including a return to his prep school, where he remembers a teacher with one finger missing. From then on, we find ourselves in the usual Innes universe of strange encounters, implausible coincidences, and literature-quoting eccentrics. I often find myself googling quotes while reading Michael Innes, and it makes me feel very poorly educated !
This is more a thriller, or an espionage novel, than a mystery or police procedural. I enjoyed it, but less than most Michael Innes novels. Perhaps that's because this book, from 1971, reflects a very different Zeitgeist than the earlier novels from the post-WWII period.