A much better series about deep cover spies was the BBC miniseries "Sleepers", about a pair of KGB deep cover operatives--"sleeper agents"--sent to Britain in the 1960s, told to build up ordinary lives, and wait to be contacted.
Years and years go by, and the call never comes. They have married, raised children, and become, for all intents and purposes, good Englishmen. One is an upper-crust investment banker, the other is a working class bloke, and they have totally assimilated.
Suddenly, it's 1991, and the Soviet Union collapses, and the remnants of the KGB are trying to take inventory of all their foreign assets. At this point, someone realizes they've misplaced two sleepers. Their covert transceivers suddenly start beeping.