Question: What is the name of the first novel in the series that the television series starring Benedict Cumberbatch is based on?
Sentence (from "Sherlock (TV series)"): "Sherlock" is a co-production of the British network BBC and the American station WGBH Boston for its "Masterpiece" anthology series on PBS, along with Hartswood Films, with Moffat, Gatiss, Sue Vertue and Rebecca Eaton serving as executive producers.
Relevant evidence: No