The Code Busters Club in Japanese!

In Japan, The Code Busters Club series by Penny Warner is titled 暗号クラブ (Ango Club), which translates directly to "Cipher/Code Club". It is published with Japanese text and frequently features illustrations by Hyogonosuke. A spin-off series, The Code Busters Spy Club, is known in Japan as スパイ暗号クラブ (Spy Ango Club). 

Illustrations by Mr. Hyogonosuke, Media Factory, Japan

Book #1 - SECRET OF THE SKELETON KEY

The View of San Francisco from Berkeley - Cody and M.E. off to school

The Code Busters secret clubhouse - Skeleton Man's burned out house

Research at the Public Library - Food fight in the cafeteria

A coded message in Skeleton Man's safe - A surprise visit by strangers