This is the second Christie novel featuring Superintendent Battle and Lady Eileen 'Bundle' Brent. It's set four years after the Secret of Chimneys in the 1920s.
Bundle, now a young lady, stumbles on a mystery that began whilst Chimneys was leased for the past two years. What's the significance of the seven clocks? What did Gerry Wade mean by the Seven Dials? Who killed Ronny Devereaux and what does it all have to do with a formula for steel?
Bundle, in her usual exuberant manner, bumbles about, often finding clues by accident. Enlisting the help of Jimmy, Lorraine and Bill, they inflict themselves on the ever tolerant Superintendent Battle who also seems to be involved in the mystery.
I really enjoyed it, but I don't believe there is a Christie I haven't liked. What I really would have loved is for Christie to have written more mysteries featuring Bundle, who is just such an engaging character, I wanted her story to go on and on.