Janice Hallett is a former magazine editor, award-winning journalist, and government communications writer. She wrote articles and speeches for, among others, the Cabinet Office, Home Office, and Department for International Development. Her enthusiasm for travel has taken her around the world several times, from Madagascar to the Galapagos, Guatemala to Zimbabwe, Japan, Russia, and South Korea. A playwright and screenwriter, she penned the feminist Shakespearean stage comedy NetherBard and cowrote the feature film Retreat. She lives in London and is the author of The Silent Appeal, The Killer Question, The Examiner, The Mysterious Case of the Alperton Angels, The Christmas Appeal, The Twyford Code, and The Appeal.

Joe Hill is the author of the New York Times bestsellers Heart-Shaped Box and Horns and writes an ongoing comic book series, Locke & Key. He makes lots of noise on Twitter under the handle @joe_hill.

Steve Cavanagh is the bestselling and award-winning author of several books, including the Eddie Flynn series and Kill for Me, Kill for You. A former lawyer, he was born and raised in Belfast, Northern Ireland, where he still lives. Find out more at SteveCavanaghAuthor.com.