In Manchester, New Hampshire, fourteen-year-old Pamela Mason is murdered. Edward Coolidge is tried and convicted of the crime, but the conviction is set aside by the landmark Fourth Amendment case Coolidge v. New Hampshire (1971).

Manchester is the most populous city in the U.S. state of New Hampshire. Located on the banks of the Merrimack River, it had a population of 115,644 at the 2020 census. Manchester is the tenth-most populous city in New England. Along with the city of Nashua, it is one of two seats of New Hampshire's most populous county, Hillsborough County. The Manchester–Nashua metropolitan area has approximately 423,000 residents and lies near the northern end of the Northeast megalopolis.

The Fourth Amendment to the United States Constitution is part of the Bill of Rights. It prohibits unreasonable searches and seizures and sets requirements for issuing warrants: warrants must be issued by a judge or magistrate, justified by probable cause, supported by oath or affirmation, and must particularly describe the place to be searched and the persons or things to be seized.

Coolidge v. New Hampshire, 403 U.S. 443 (1971), was a United States Supreme Court case dealing with the Fourth Amendment and the automobile exception.