‘It's off' he yelled.

Then, keeping his eye on the sky as he went, he started down the path at the side of the house.

When he reached the front the bird was still in sight. Cal leapt the fence and crossed Chariot Street at a run, determined to give chase. It was, he knew, an all but hopeless pursuit. With a tail wind a prime bird could reach a top speed of 70 miles an hour, and though 33 had not raced for the best part of a year he could still easily outpace a human runner. But he also knew he couldn't go back to his father without making some effort to track the escapee, however futile.

At the bottom of the street he lost sight of his quarry behind the rooftops, and so made a detour to the foot bridge that crossed the Woolton Road, mounting the steps three and four at a time. From the top he was rewarded with a good view of the city. North towards Woolton Hill, and off East, and South-East, over Allerton towards Hunt's Cross. Row upon row of council house roofs presented themselves; shimmering in the fierce heat of the afternoon, the herringbone rhythm of the dose-packed streets rapidly giving way to the industrial wastelands of Speke.

Cal could see the pigeon too, though he was a rapidly diminishing dot.

It mattered little, for from this elevation 33's destination was perfectly apparent. Less than two miles from the bridge the air was full of wheeling birds, drawn to the spot no doubt by some concentration of food in the area. Every year brought at least one such day, when the ant or gnat population suddenly boomed, and the bird life of the city was united in its gluttony. Gulls up from the mud banks of the Mersey, flying tip to tip with thrush and jackdaw and starling, all content to join the jamboree while the summer still warmed their backs.