Sant nodded. ‘This was no off-the-cuff killing. At any rate, Dryden’s wasn’t. But one thing does puzzle me: the sheer scale of the bloodbath. Dryden was killed in cold blood, but why choose a moving bus as a location for murder? Why not bide one’s time and wait till the journey was over and a darkened street presented itself? Killing sprees are not the stuff of a rational-minded assassin.’
‘I suppose once he started he couldn’t stop,’ said Holdsworth. ‘Leave nothing to chance, no witnesses.’
‘Unless we’re wrong and we’ve got a random madman on our hands,’ Capstick put in.
Holdsworth returned to the sketch and pointed a pencil midway along the upper deck at the letters B and C. ‘Sitting directly behind Dryden, in the seats just beyond the stairwell recess, were Kate Andrews and Callum Wi
