Can we say "obstruction of justice", thought you could. Today this would have got dealt with in a different way (I'd kinda like Randall to meet Peter Grant for a few rounds of debate). Still this is from a different time and a different way of policing.
No-one really misses Dear Old Uncle Gregory when he dies and when it's discovered that it was murder a fractured family find more cracks. The over-confident of his own smarts Randall rubs everyone up the wrong way in order to sit back and watch sparks fly while Inspector Hannasyde tries to discover the truth. The obvious culprit is someone in the family, but who, and why, everyone has a reason but also an alibi.
Then another member dies...
It's an interesting read, a classic period detective story with some horrible people and a hero who could be truly horrible, along with a romance that seemed to come out of no-where. Still the family was well drawn and I found them believable.
ETA: The narration wasn't stand-out for me but it didn't detract for me from the story.