From the publisher's website:
Mrs. Amethyst, Mr. Flannigan, Mr. Shao, Mr. Dolby, and Miss Herne... These are some of the 1930s SPA agents ready to combat the trails that await them!
All of these characters are Heroic rank and all ready to play. They are designed for Noir Knights, but can be played in any Heroic rank Suzerain game.