Freeman Wills Crofts published Inspector French and the Starvel Tragedy (aka The Starvel Hollow Tragedy) in 1927. It's often cited as one of his best books, and I concur with that view. The story is readable from start to finish, and the plot is worked out rather cleverly. So although I latched on to one aspect of the solution at an early stage, Crofts managed to confuse me with some rather neat twists.
At first, the focus is on an attractive young woman who lives with her miserly uncle in a Yorkshire mansion - the location seemed from internal evidence to be somewhere in the vicinity of Helmsby and Thirsk. After she goes away on a short visit to a friend, she returns to find the house burned to the ground. Three corpses are discovered, evidently those of her uncle and two servants. At first it looks like a tragic accident.
But a local bank manager takes a different view, and before long Scotland Yard are called in, in the person of good old Inspector Joseph French. He's portrayed in a rather human fashion, yearning for promotion and keen to keep on the right side of his superiors, but utterly relentless in his pursuit of the guilty once it becomes clear that this is a case of arson and multiple murder.
As with The Cask, Crofts manages to sustain interest in the detailed police investigation by offering a sequence of surprising developments. I enjoyed this book - which was reissued by Hogarth back in the 80s - and can recommend it to anyone who likes Croftsian writing. Crofts was an engineer by profession and this mystery is certainly engineered with high calibre craftsmanship.