Plot

As the government prepares to sell off the telecommunications network to the highest bidder, including Starling Industries, Sarah investigates a spate of unexplained deaths in phone boxes across the capital. Elsewhere, Harry is vetting the bidding companies on behalf of UNIT, delighted when the assignment converges with his old friend - and her robot dog! Sarah and Harry realise they are investigating the same thing - why is government minister Sir Gordon Carmichael covering up the 'phone box murders', and what alien power is Violet Starling preparing to unleash?

As the government prepares to sell off the telecommunications network to the highest bidder, including Starling Industries, Sarah investigates a spare of unexplained deaths in the phones boxes across the capital. Elsewhere, Harry is vetting the bidding companies on behalf of UNIT, delighted when the assignment converges with his old friend - and her robot dog. Sarah and Harry realise they are investigating the same thing - why is government minister Sir Gordon Carmichael covering up the 'phone box murders', and what alien power is Violet Starling preparing to unleash?