An astringent lieutenant, a carefree sergeant, a reckless detective, a hardened cop, a cunning senator, an apathetic secretary.

The Canterlot Secret Service was created to investigate and deal with foreign threats to the State of Canterlot, its existence known only to a select few. The service has kept itself hidden from the public through what is known as Quality Control. Subsequently, its agents informally refer to the Secret Service as Quality.