Glamorous Diana Dawn, district attorney Richard Day's secretary, was - unbeknownst to him - masquerading as the mysterious female sleuth the Black Orchid. She solved crimes with the aid of a magic ring that contains "black gas" that knocked out her opponents. In her first adventure, Black Orchid took on (the somewhat unfortunately named) Doctor Arso to regain some stolen surgical papers; and she fought zombies, too. In the second adventure, she battled a man named Carson (and his Torchmen) who had kidnapped a scientist.