The Seven Dials mystery, by Agatha Christie

The Seven Dials mystery is Agatha Christie's ninth novel and second starring Superintendent Battle. Like The Secret of Chimneys, although Battle is the primary detective on site, much of the detecting is done by amateur sleuths who work with Battle to reveal the killer. In this book, a murder takes place at Chimneys, the estate that also figured in the earlier book, and it is followed by another suspicious death of a man who had been one of the guests at Chimneys when the first murder occurred. Bundle, the daughter of the owner of Chimneys decides to investigate the murders, and discovers the existence of a secret cabal located in a nightclub in the Seven Dials neighborhood of London. Bit by bit, she and her friends follow clues to identify the murderer. This book is both intriguing and amusing, with plucky characters and a lot of humor.