The Red Circle (1960), the second of Rialto's German Edgar Wallace krimis. There's a blackmail racket, a question of inheritance, a sexy bad girl and lots of murders. Well-paced, well-crafted, stylish and wildly and deliriously entertaining.
My review: https://princeplanetmovies.blogspot.com/2023/06/the-red-circle-der-rote-kreis-1960.html