Four decades ago, little was known or understood about false confessions and the reasons behind them. So much has changed since then due in part to the diligent work done by Gisli H. Gudjonsson. This eye-opening book by the Icelandic/British clinical forensic psychologist, who in the mid 1970s had worked as detective in Reykjavik, offers a complete and current analysis of how the study of the psychology of false confessions came about, including the relevant theories and empirical/experimental evidence base. It also provides a reflective review of the gradual development of the science and how it can be applied to real life cases. Based on Gudjonsson’s personal account of the biggest murder investigations in Iceland’s history, as well as other landmark cases, takes readers inside the minds of those who sit on both sides of the interrogation table to examine why confessions to crimes occur even when the confessor is innocent. Presented in three parts, the book covers how the science of studying false confessions emerged and grew to become a regular field of practice. It then goes deep into the investigation of the mid-1970s assumed murders of two men in Iceland and the people held responsible for them. It finishes with an in-depth psychological analysis of the confessions of the six people convicted. is an important source book for students, academics, criminologists, and clinical, forensic, and social psychologists and psychiatrists.