This short story by F.R. Buckley appeared in the April, 1947 issue of Adventure. I like this series very much and this is a typical entry – Caradosso offers advice to the new Duke about an alchemist who is selling the duke a super-explosive. As usual, Caradosso has his tongue firmly in cheek and his hand out asking for a favor while managing to mock the Duke and the alchemist.
Download the story here.