As part of its 2020 Christmas lineup, BBC Sounds will be making The Cipher available as a boxset. But what is it?

First off, there’s the cast. The Cipher stars Anya Chalotra (Yennefer in The Witcher) and Chance Perdoma (Chilling Adventures of Sabrina).

The Cipher sees a cryptic puzzle appear on the internet, stumping the brightest minds in the world. When 16 year old Sabrina (Anya Chalotra) cracks the code, she finds herself at the heart of an international hunt for a serial killer… a killer who might not be from this world. Joined by New York teen Benny (Chance Perdomo) — the only other person to solve the cryptic Parallax puzzle, Sabrina embarks on a journey that turns her whole world upside down, throwing everything and everyone she’s ever known into question. A fresh take on the hopepunk genre, The Cipher is a thriller about finding yourself while finding a killer.

Chance Perdomo says: “It been really great working with Anya on The Cipher podcast for BBC Sounds. I can’t wait for everyone to have a listen later this year — if you’re a fan of likes of Stranger Things or The OA, you will love this story – its definitely not one to be missed!”

The large cast also includes: Samuel Adewunmi (The Last Tree), Hera Hilmar (Mortal Engines), Leanne Best (The Woman In Black 2), Molly Harris (Doctor Who), Enzo Cilenti (Game Of Thrones), and Olivia Popica (Fantastic Beasts: The Crimes Of Grindelwald). The Cipher was created and written by Brett Neichin, with co-writer Ayeesha Menon. The executive producer and director is John Scott Dryden. It was commissioned from Goldhawk Productions.