And Then There Were 62: The Secret of Chimneys by Agatha Christie

Are you a reader who loved "The Man in the Brown Suit" but found it
sorely lacking in English country homes? Well, fear not, because
this week's episode tackles a Christie novel overflowing with rose
gardens, secret passageways, and... chimneys. Does the novel also
bear a somewhat suspicious similarity to the plot of our last
novel? It does! Join us as we explore this similarity, as well as
the intricacies of fictional Balkan geopolitics, diamond thievery,
and... chimneys... in this, Superintendent Battle's first case.