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replied the Doctor, taking out the eyeglass and staring at Jamie with troubled eyes. 'But it has nothing whatever to do with simple radio technology.'
    While the Doctor fiddled about inside the radio, muttering to himself and taking absent-minded swigs of cold coffee from Zoe's abandoned cup, Jamie wandered aimlessly around the room scowling at the zany blow-ups of Isobel adorning the walls. Suddenly he stopped in his tracks. 'Surely they'd leave us a wee note, Doctor,' he suggested.
    'On the wall!' shouted the Doctor, jumping up and tossing him the pieces of the radio.
    Jamie gaped at him in astonishment.
    'You can't lose a wall can you!' the Doctor quipped, echoing Isobel's words as he hurried into the hall.
    Jamie trailed after him, gloomily contemplating the remains of his radio.
    'Here we are,' the Doctor confirmed, twisting himself almost horizontal to decipher a patch of barely legible scrawl beside the telephone. 'Oh my goodness me,' he whispered. 'Gone to IE office to look for you. Z and I.'
    The Doctor bounded to the front door and wrenched it open.
    'Come on, Jamie, we must get after them!'
    Jamie frowned wearily. 'Och, it's miles, Doctor. Could we no get a lift this time?'
    The Doctor shook his head vehemently. 'No, we most certainly could not, Jamie. We shall hail a taxi!' he insisted.
     
    3

Cat and Mouse
    Crouching beside the Doctor between two huge rubbish skips in the cul-de-sac alongside the International Electrornatix Building, Jamie ground his teeth in frustration.
    'I thought we were going in there to find the lassies,' he complained.
    The Doctor shook his head determinedly. 'We'd never get past that stupid computer, Jamie. Besides, the girls might not be in there.
    We don't want to aggravate Vaughn unnecessarily.'
    'Then what the divil are we going to do?'
    The Doctor took out the polyvox unit given him by the Brigadier, deployed the aerial and pressed the call button. 'If the Brigadier's men are watching the building they'll know whether the girls are inside or not,' he explained.
    Eventually the Brigadier's voice crackled through a haze of interference. 'Sorry about reception, Doctor, but we're airborne at the moment. Routine change of location for security cover.'
    The Doctor asked whether Zoe and Isobel had been sighted.
    'Affirmative, Doctor. We have a report of two teenage females, one dark and one fair, clad in strange attire. Went in about an hour ago.'
    The Doctor grabbed Jamie's belt with his free hand to prevent the headstrong Highlander from dashing to the rescue there and then.
    He informed the Brigadier that they were going to try and enter the building from the rear.
    'Take care, Doctor,' crackled Lethbridge-Stewart. 'You may not be quite so lucky this time. Give me a shout if you hit any snags.'
    'Yes. Thank you, Brigadier. Under and off...'
    'Over and out,' came the crisp response.
    Jamie contemplated the Doctor with less than whole-hearted confidence as he struggled to stow the aerial. 'Pity it doesn't play guid tunes like ma radio used to,' he scoffed.
     
    They stared across at the vast expanse of coppery glass towering above them.
    'And how are we going to get in this time?' Jamie demanded sceptically.
    The Doctor grinned mischievously. 'By train, of course. But we must hurry, or we'll miss it...'
    Far above the City streets, Vaughn reclined in his chair listening to Gregory's bewildered report on the Doctor's two circuit panels.
    'They just make no sense,' whined the wretched technician helplessly. 'The connections seem completely illogical and the conductor material is no known alloy, though it resembles Helenium.'
    Vaughn took the panels and studied them, smiling mysteriously. 'Fascinating. The Doctor intrigues me more and more,'
    he murmured languidly.
    'I can do more tests, Mr Vaughn...' Gregory offered anxiously.
    Vaughn waved him away. 'I think I know the solution to this little mystery,' he said quietly.
    As soon as Gregory had gone, Vaughn took out his fountain pen and