Melodrama set in Victorian Brighton. Scheming pub landlady uses the timorous son of a domineering pharmacist to assist in the poisoning of her drunkard husband. (The title is from the way pharmacists used to wrap parcels containing poison).

The Battersea Bats are a gang of four kids who have their den in an abandoned building near the Thames, and they have a plan of action in mind because in about a week there is a soapbox derby being held, a contest they mean to win.