Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation.

A team of agents in the British security intelligence service work to protect the U.K. from terrorists and other threats to national security. A repackaged version of the BBC series "Spooks," "MI-5" follows a counterterrorism unit based in the highly secure suite of offices called The Grid, where Harry Pearce oversees the team and deals with the often dirty politics of the spy game.