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Do artigo da Wikipédia:
The series centers on World Securities Corporation, a high-tech international private investigation company that employs field operatives—the elite of whom are aided by implanted audio receivers and who carry Scanners, tiny video camera/telemetry units which can be attached to tie clips or other jewelry. The most common method is to wear the Scanner on a ring, enabling it to be discreetly aimed.
Each episode features one of three primary agents on a particular investigation, which often have political or organized crime elements.