This text examines 50 capital crimes committed in England, Scotland and Wales in the 20th century. It examines murder cases where the accused was found guilty and either executed, or dentenced to life imprisonment. In each case it is argued that there was reasonable doubt, either as to the guilt, or the sanity of the accused. At the same time, the case for the prosecution is described so that the coverage is balanced and informative. In some cases, but not others, the original convictions have now been quashed. In each instance, full details including important dates, facts, names, witnesses and statements are provided.;The cases covered include: Birmingham Six; Bridgewater Four; Derek William Bentley; Guidford Four; James Hanratty; Judith Ward; Steven Kisko; and Timothy John Evans.