Charlie Chan is a radio show centered around a fictional Hawaiian police detective created by author Earl Derr Biggers. The show features Detective Chan, a benevolent and heroic Chinese-American who was developed as an alternative to the negative and clichéd portrayals of East Asians in Hollywood in the early 20th century. Many episodes showcase Chan traveling around the world solving mysteries and uncovering criminals. The character carries a reputation for his wit, intelligence, and wisdom, which helped counteract and challenge existing Asian stereotypes.

The detective serial aired in the late 1940s and gained popularity due to the Charlie Chan film adaptations that were also in circulation, with more than 40 films made between the 1930s and 1949. All the movies starred non-Chinese actors as Charlie. Unfortunately, the number of Charlie Chan radio serial recordings is limited, with the majority believed to be lost. Although the complete storylines are incomplete, the existing episode recordings still offer a glimpse into the unique and mysterious world of Detective Charlie Chan.

Sources: wikipedia.org, otrcat.com