The Wiley Series in the Psychology of Crime, Policing and the Law publishes both single and multi-authored monographs and edited reviews of important and emerging areas of contemporary research. The purpose of this series is not merely to present research findings in a clear and readable form, but also to bring out their implications for both practice and policy. Books in this series are useful not only to psychologists, but also to all those involved in crime detection and prevention, child protection, policing and judicial processes. The terms ‘Suggestible’ and ‘Suggestibility’ must be among the most widely used but least understood descriptors in law and psychology. These labels have been applied across a diverse range of persons and situations: from the character of a young offender, through the memories of a child witness, to characterizing the continuing beliefs among world leaders regarding the presence of weapons of mass destruction in Iraq. Given this ubiquity, it is perhaps surprising that so few books have been devoted to pinning down this elusive concept and exploring its impact on crime and the law.