G. T. Karber is the award-winning creator of Murdle, the global bestselling puzzle sensation. He grew up in Arkansas, the son of a judge and a civil rights attorney and graduated summa cum laude from the University of Arkansas with a degree in mathematics and English literature, before gaining an MFA from the University of Southern California's School of Cinematic Arts. He is the General Secretary of the Hollywood Mystery Society and one of only three non-British authors to have ever published a number one Christmas bestseller in the UK.

Wendy Mass is a New York Times bestselling children's author. Her first book was A Mango-Shaped Space, and since then she has written thirty-one novels for young people. Wendy lives in New Jersey with her family.