Mrs. Millicent Newberry has her own very successful detective agency. She has her own unique way of solving crimes. Newberry also has some independent thoughts about criminal justice and she is also unique in a way that she insists to be involved in determining a sentence for criminals she catches. When Tom Corbin, her former boss and mentor, comes to her agency offering partnership, she declines, but takes on the case of the infamous Mason jewels. Corbin was unable to solve this case couple of years ago, but there are some new clues as Corbin's main suspect was now dead. Newberry moves in the Mason mention as a sewing-woman in order to observe and follow the situation. While inquiring and snooping, she is knitting a cute little green jacket.