The long convoy of carriages eased to a halt at the platform and the whirring of the locomotive died away. The driver clambered down from his cab and headed for the canteen, passing the rows of darkened trains drawn up at the other platforms in readiness for the early morning departures, still several hours away.

For a moment it seemed as though the train which had just arrived was also empty. Then a door opened, halfway along. A man stepped down to the platform and stood sniffing the air. He was tall and rather gaunt, with a pale, grave face dominated by an angular nose. He wore a long overcoat and a homburg hat, from beneath which emerged tufts of dark hair streaked here and there with silver.

The line of sleeping cars jolted slightly as a locomotive was coupled to the other end, ready to pull the train back across the long bridge to the mainland to continue its journey to Trieste. Reaching up to the floor of the carriage, the man lifted down a battered leather suitcase, slammed the door shut and set off along the platform. The station was deserted, the cafe and newsagent’s closed. The man walked through the harsh glare of the foyer and out on to the broad steps where he paused again, scenting the air. Then, as though satisfied, he started down the steps and turned left.

At the foot of the Scalzi bridge two youths were unloading bundles of newspapers and magazines from a motorboat and stacking them beside a shuttered kiosk. The man spoke to them in dialect. One of the lads flourished a knife with which he slit open a pack of papers like gutting a fish. Money changed hands. The man turned away, scanning the headlines: MESTRE SMOG ALARM and GREEN LIGHT FOR THE LAGOON METRO.