French Johana Gustawsson and Norwegian Thomas Enger are the international bestselling authors of the Roy & Castells and Henning Juul crime series respectively, published in more than 50 countries worldwide. SON, which kickstarts their new series set in Norway, is the first collaboration of the two former journalists. It stars social psychologist Dr. Kari Voss, a world-renowned expert in memory and body language, commonly known as 'The human lie detector'.