Peter Swanson is the Sunday Times and New York Times bestselling author of seven novels, including The Kind Worth Killing, finalist for the CWA Ian Fleming Steel Dagger, Her Every Fear, an NPR book of the year; and his most recent, Every Vow You Break and his books have been translated into over 30 languages. He tweets at @PeterSwanson3.

Cara Black is the author of nineteen books in the New York Times bestselling Aimée Leduc series. She has received multiple nominations for the Anthony and Macavity Awards, and her books have been translated into German, Norwegian, Japanese, French, Spanish, Italian, and Hebrew. She lives in San Francisco with her husband and son. She can be found tweeting at @carablack.

James Lovegrove is the New York Times bestselling author of The Age of Odin. He has been short-listed for many awards including the Arthur C. Clarke Award, the John W. Campbell Memorial Award, and the Scribe Award. He won the Seiun Award for Best Foreign Language Short Story in 2011, and the Dragon Award in 2020 for Firefly: The Ghost Machine. He has written many acclaimed Sherlock Holmes novels, including Sherlock Holmes and the Christmas Demon. As well as writing books, he reviews fiction for the Financial Times. He lives in Eastbourne in the UK.