The 22nd book of this historical series finds Frank and Sarah Mallory involved in finding out who killed Mr. Pritchard who owns a milk farm. He is the father of Thea, a neighbor. The police are not interested in solving this case. While searching for the answer, there is another death, the son of Mr. Pritchard. There are several clues to what happened. The ending is a surprise. There is information on milk delivery at the turn of century and the cause of many deaths. There is a side story involving Sarah's Clinic that added to the book. I HIGHLY RECOMMEND THIS BOOK AND SERIES. Disclosure: Many thanks to NetGalley and Berkley Publishing Group for a review copy. The opinions expressed are my own.