I had never heard of this series when I picked up The Oxygen Murder in a Little Library Box. This book is the eighth in the series, so I didn't have any back story. Luckily, the book kept my interest on its own. I was delighted to discover that the main characters were long time residents of a town near my own, and that they were on a business/vacation trip in New York City when the problems started. It is a good mystery with corporate greed and the public health consequences of said greed as the driving force. A body is found where it absolutely should not be, a bump in a dark alley, unfortunate elevator incidents, documents slipping out of folders, and so on. There is an interesting assortment of characters, well developed, including retired scientist Gloria, the snoopy sleuth, married just four months to the widowed Revere, MA detective Matt, and his niece New York City filmmaker Lori, a young woman who has made some questionable choices which she now regrets, with frightening fallout. I enjoyed the many science references, the police collaboration between Matt and his N.Y. contacts, and the over the top fashion and design obsession of family friend Rose. I was also sentimentally pleased with now vintage references like "Charlie on the MTA", the Revere Beach amusement rides, and the area near the shining Trump Tower as a desirable place to visit, live, or work. A lot of the book is development; the big action mostly takes place at the end. I would certainly read another book from the Periodic Table Mystery series. Three and three quarters stars.