MUMBAI: UK pubcaster the BBC has announced that its spy show Spooks will return later this year on BBC One. The complex relationship between the UK, Iran and the US is put under the spotlight ... but who can really be trusted under this new world order? In India the show airs on BBC Entertainment which is carried on Tata Sky.

Over the course of 10 hour-long episodes, Adam, Harry and the team are immersed in their most intricate operation to date. The broadcaster says that the distinction between friend and foe becomes ever more blurred. Rupert Penry-Jones, Hermione Norris and Peter Firth return as officers Adam, Ros and Harry of Section D, MI5.

Raza Jaffrey, Miranda Raison and Hugh Simon also reprise their roles as Zaf, Jo and Malcolm, and welcome new arrival Connie played by Gemma Jones. In the drama, Iran's covert scheme to become a nuclear power leads to growing mistrust between the British, American and Iranian governments, who all nurse their own agendas to help or hinder the Middle Eastern state in its efforts.

The volatile climate culminates in a series of high risk operations both at home and abroad. The opening episode sees Zaf, undercover in Tehran, attempt to place a bomb on a civilian train in an effort to flush out a key Iranian spy, an act which could have dangerous ramifications not only for Zaf but for the whole team.

Meanwhile, the electric atmosphere between Adam and Ros comes to a head, but things are complicated further by Adam's dangerous ongoing affair with a key asset inside the Iranian embassy.

Spooks producer Katie Swinden says, "For the first time ever, we've chosen to explore one theme throughout the series, and one which is an ongoing concern in today's world affairs agenda. The relationship between Britain, Iran and the US is such a delicate and topical issue that it opens up a wealth of new storyline possibilities to us.

"Audiences will be able to follow Adam, Harry, Ros and the team as they take on their most challenging operation to date, and will get to see them in a whole new range of dangerous and exciting situations."

The BBC executive producer Sarah Brandist says, "Spooks, one of the autumn highlights for both BBC Drama and BBC One and this year, takes on a more global feel by telling bigger, bolder stories across a wider landscape.

"BBC One viewers, who are already eagerly awaiting the gang's return, will be treated to an explosive opening two-parter and, from then on, the action flows from beginning to end. Spooks has returned in style."