Double jeopardy is a procedural defence that forbids a defendant from being tried again on the same (or similar) charges following a legitimate acquittal or conviction. In common law countries, a defendant may enter a peremptory plea of autrefois acquit or autrefois convict (autrefois means "in the past" in French), meaning the defendant has been acquitted or convicted of the same offence.
If this issue is raised, evidence will be placed before the court, which will normally rule as a preliminary matter whether the plea is substantiated; if it is, the projected trial will be prevented from proceeding. In some countries, including Canada, Mexico, and the United States, the guarantee against being "twice put in jeopardy" is a constitutional right. In other countries, the protection is afforded by statute law.
Jeopardy! is an American television quiz show created by Merv Griffin, in which contestants are presented with clues in the form of answers, and must phrase their responses in the form of a question. Over the years, the show has expanded its brand beyond television and been licensed into products of various formats.
In 1990, host Alex Trebek co-authored The Jeopardy! Book along with Peter Barsocchini, which included boards from some of their past tournament games as well as boards specializing in some of the show's various categories. (Trebek also voiced the audiobook, which featured the "behind the scenes" material on tape one, and audio versions of select games from the book on tape two.) Its sequel The Jeopardy! Challenge, also co-authored by Trebek, along with Griffin, included boards from their past tournament games, and was published in 1992.