By the time Tony had navigated his way to the Marina Widenfeld a watery sun was burning off the last of the clouds. The marina was packed with boats, ranging from Rhineships lying low in the water to small pleasure craft with their cockpits covered in tarpaulins. A few people were on deck, swabbing down after the rain or doing the small maintenance jobs that were easily overlooked during the normal working of the river. There were a couple of bars and cafés set back from the wharves, and a large chandlers that announced diesel at competitive prices.

Tony found a space at the far end of the car park and sat for a few moments, lost in thought. ‘You’re out there,’ he said under his breath. ‘I know it. We’re going to meet today, Geronimo. And you’re going to have no idea who I am. I’ll be one more nosy tourist, filling an hour before dinner, admiring your boat. Because I’ve got a hunch it’ll be worth admiring. You kill so neatly, you won’t live sloppily.’

He got out of the car and started a slow meander around the commercial area of the marina. The working barges were remarkable, he thought. Each was different, each spoke of the character of its owner and crew. There were immaculately kept boats, with troughs of herbs and plants anywhere that wasn’t in the way of work. There were scruffy coal barges with wheelhouses seamed with rust and blistered with old paint. Some had neat lace curtains at the windows, while others were adorned with elaborate flounces and ruching. Bright, fresh paintwork sat alongside varnished wood. Several had bikes chained to the safety rails, while others had cars squatting incongruously on the stern roofs. There was endless variety, right down to the pennants and flags that hung limp in the damp air.

Tony sauntered along, camera round his neck, occasionally pretending to take photographs of some of the finer specimens. He had passed a score of barges and Rhineships without success when he rounded a corner of the marina and almost walked into a black Golf. Right next to it was a magnificent wooden ship, its woodwork glistening with yacht varnish. Across the stern, in flowing cursive, he read Wilhelmina Rosen, Hamburg.