I must admit a level of disappointment. I am getting these films from a list called Best British Noirs. I have to say that I haven't found the level very high. It's also possible I have already seen the best ones.
This film takes 45 minutes for a plot to develop. I know films have lost the art of the buildup, but it's one thing when you're waiting for the San Francisco earthquake to start and another for a woman to decide to poison her husband.
Most of the film, set in Victorian England, concerns a family run by a strict and unreasonable father. The son in the family meets the flirtatious soon to be widowed Googie Withers. She uses him to make a boyfriend jealous and then steals strychnine from the family pharmacy to kill her drunk husband.
A subplot has to do with the older daughter wanting to pursue professional classical singing. The singing did capture that old-fashioned technique students were trained in, with lots of tremolo.
The title refers to the way pharmacists wrapped their packages.
Googie livens up the proceedings.