[sufue]

Two titles by Leo Bruce are on US Kindle Countdown:

Dead Men's Shoes is the fourth in the Carolus Deene series, at $0.99 for about 12 more hours before going up to $1.99 for an unknown amount of time.
link: http://www.amazon.com/Dead-Mans-Shoe...dp/B013RIQAPA/

Spoiler:

Everyone knew there'd been a murder, everyone knew who the murderer was, and when this murderer committed suicide by jumping overboard from the cargo boat Saragossa, they thought "Good riddance." And everyone, the police included, dropped the case. Everyone, that is, except Carlous Deene.

Case for Three Detectives is the first in the Sergeant Beef series, at $1.99 for about one more day before going up to $2.99 for an unknown amount of time.
link: http://www.amazon.com/gp/product/B00VROVXSQ

Spoiler:

Possibly the most unusual mystery ever written. A murder is committed, behind closed doors, in bizarre circumstances. Three amateur detectives take the case: Lord Simon Plimsoll, Monsieur Amer Picon, and Monsignor Smith (in whom discerning readers will note likeness to some familiar literary figures). Each arrives at his own brilliant solution, starting in its originality, ironclad in its logic. Meanwhile Sergeant Beef sits contemptuously in the background. "But," says Sergeant Beef, "I know who done it!"