Darko allowed himself a thin smile. Tadzio hadn’t lost it. ‘You want me to make sure he never gets as far as the police station?’

‘I want you to do whatever it takes. But make it look good, Darko. Give the press something to take their minds off all those dead wasters.’ He poured two cups of coffee, pushing one towards the Serb.

‘I’ve already got one or two ideas on that score.’ He raised his cup in a toast. ‘Leave it with me. You won’t be disappointed.’

‘No,’ Tadeusz said firmly. ‘I won’t be. Now, losing Kamal leaves us with a gap. Who’s going to fill it, Darko? Who’s got what it takes to walk in a dead man’s shoes?’

It had been a long day, but Brigadier Marijke van Hasselt was too wired for sleep. She’d delivered the results of the postmortem – death by drowning, as de Vries had tentatively predicted early on in the autopsy – at a briefing with her boss, Maartens, and her opposite number, Tom Brucke. Though none of them had said it in so many words, they really didn’t have a single lead.

They’d masked the insecurity this inevitably produced with the familiar police routines that they all knew in their bones. Briskly, Maartens had outlined the ground rules for the investigation, assigning tasks to one team or the other, acting as if this was a directed inquiry that already had its terms of reference clearly mapped out. But they all knew they were groping in the dark for Pieter de Groot’s killer.

Most murders were easy. They fell into one of three broad categories: domestic disputes jacked up one step too far; drunken brawls that escalated beyond the initial intent; or the incidentals of other criminal activity, usually connected to drugs or violent robbery. The Leiden killing didn’t fit any of these categories. Nobody in the victim’s immediate circle had an obvious motive, nor was this the kind of murder that arose from the engorged or embittered passions of domestic relationships. Besides, the ex-wife and the current girlfriend both had alibis, the one at home with her children, the other visiting her sister in Maastricht.

Maartens had remarked that they needed to take a look at his professional life. He couldn’t imagine that anyone at the university would have turned to murder to solve some scholastic dispute, but with so few threads to grasp, they had to be sure they weren’t missing the obvious. He’d heard that passions could run high in the rarefied atmosphere of academic research, and there were some very strange people around in higher education, especially in areas like psychology.