Y... I don't think they can any longer call it "based on stories by ADC"
Except that next week's episode is the only one of the entire set that takes its title directly from a Conan Doyle work. Apparently.
Last night's episode was entitled "The Lying Detective", loosely based on AC-D's "The Adventure of the Dying Detective" whose villain was a man named "Culverton Smith" who attempted to murder Sherlock...