In 1973, the FBI established the "Special Target Information Development" program, where agents were sent undercover to penetrate the Weather Underground.

A policeman who happens to be a talented amateur singer is sent undercover to join the opera company and try to find out whether there is any substance to the allegations.

He had been sent undercover to spy on Herod Sayle and his Stormbreaker computers.

Sally Lomax (Patricia Mort) is sent undercover to find what has happened to 12 au pairs who have vanished, one having recently turned up dead.

Lt. John Murphy is sent undercover to find them.

Summoned by military intelligence to Washington, DC, Reacher is sent undercover.

He explains that he was sent undercover by the commissioner as even he smelled a rat.

It follows a man who is sent undercover to infiltrate an international crime organisation.

After the Bookman died in a car crash, Ray was sent undercover to replace him.

Henglaar is sent undercover to find the root of a drug problem on his brother's homeworld.