If you think you’re being watched, you’re not paranoid. If you know you’re being watched, you’re a realist. In our digital world, every move you make is being tracked by somebody who laughs at the notion that crosscut paper shredders enhance our personal security. In a universe of 1's and 0's, paper trails are replaced by bits and bytes colliding in cyberspace. You’re being watched all the time, from red light cameras to surveillance systems that rival Vegas planted in your neighborhood grocery to instantly accessible street view pictures of your domicile to every yahoo with a cell phone.

The Last Enemy, the debut entry of Masterpiece Contemporary (premiering on PBS Sunday 5 October, 9P EST) is a chilling, all too real cautionary tale about our devotion to security at the cost of personal identity. Originally broadcast earlier this year on BBC, the five-part miniseries is theoretically set in a near future, but its theme of a society underscored by personal surveillance strikes unnervingly close to home.

Stephen Ezard (Benedict Cumberbatch, Atonement) returns to Britain from a four year stint in China, where he was researching the mathematical structure of the universe, to attend his brother Michael’s (Max Beesley) funeral. Michael was apparently killed by a roadside bomb in Afghanistan, and to Stephen’s surprise, he’s mourned by numerous acquaintances due to his relief work in the region. Even more surprising to Stephen is that he finds himself in an affair with his brother’s widow, Yasim (Anamaria Marinca) the same night. He was late for the funeral — she didn’t attend it.

If all that sounds a bit convoluted and more than a little murky, it’s because it is. It’s also the foundation around which most of the events in The Last Enemy revolve. Stephen is a stranger in his own land, which has instituted more stringent surveillance on its citizenry after a terrorist attack on London. He barely recognizes the England he left years ago, rife as it is with biometric ID cards, security cameras virtually everywhere, and the implementation of the “Total Information Awareness” program, which gives the government unfettered access to personal data of every citizen. It isn’t long, however, that Stephen finds himself the media spokesman for TIA.