What happens when two people write a whodunnit together? Thanks to my guests, Cordelia Biddle and Steve Zettler. They write separately under their own names and together under the pseudonym Nero Blanc. The whole Crossword Mysteries series can be found at crosswordmysteries.com, where there are links to buy each title. There are no spoilers in this episode. My new map and guide, Agatha Christie’s England, is available now in physical form at shedunnitshow.com/map or as an audiobook at shedunnitshow.com/audiomap. Find links to all the books mentioned in this episode at shedunnitshow.com/doubletrouble. Books mentioned: — Tidy Death by Nap Lombard — The Life of G.D.H. Cole by Margaret Cole — The Floating Admiral by the Detection Club — Murder's a Swine by Nap Lombard — Enter Sir John by Clemence Dane and Helen de Guerry Simpson — Regiment of Women by Clemence Dane — The Documents in the Case by Dorothy Sayers — Strong Poison by Dorothy Sayers — Busman's Honeymoon by Dorothy Sayers — The Nursing Home Murder by Dorothy Sayers — The Crossword Murder by Nero Blanc — Death on the Diagonal by Nero Blanc Further listening: — The "Round Robin" episode about multi-author whodunnits — The "Detection Club" episode about the group of golden age authors who participated in these projects — The "Mutual Admiration Society" episode about the collaboration between Dorothy L. Sayers and Muriel St Clare Byrne NB: Links to Blackwell's are affiliate links, meaning that the podcast receives a small commission when you purchase a book there (the price remains the same for you). Blackwell's is a UK independent bookselling chain that ships internationally at no extra charge. Buying from them is a great way to support both the podcast and the book trade! Thanks to today’s sponsors: — Girlfriend Collective. Get $25 off your $100+ purchase of sustainable, ethically made activewear at girlfriend.com/shedunnit. — Beatrix Greene, an audio series by Realm. Listen now on your podcast app of choice and find out more at realm.fm. To be the first to know about future developments with the podcast, sign up for the newsletter at shedunnitshow.com/newsletter. The podcast is on Twitter, Facebook, and Instagram as @ShedunnitShow, and you can find it in all major podcast apps. Make sure you’re subscribed so you don’t miss the next episode. Click here to do that now in your app of choice. Find a full transcript of this episode at shedunnitshow.com/doubletroubletranscript Music by Audioblocks and Blue Dot Sessions. See shedunnitshow.com/musiccredits for more details.