How do you deal with those that break the law? If their aim is to evade you, how do identify them? If their aim is to lie, how do you interview them? If they don't see their actions are wrong, how do you help them to successfully reform? Criminal psychology is the discipline which tackles these challenges head on. From the signals which give away when we're lying to the psychological profiling of violent offenders, this exhaustive guide, written by the UK's top experts, is the perfect introduction.