I remember my resolve from last night, and access the system, intending to search for Sabine’s ex. But I don’t have his surname, and the incident report from the bar the other night makes no mention of it either. I debate texting her and asking for it but decide against it. Then I dial down to Roemers; I want to see if he’s got anywhere with the charity Huisman had donated to.

‘What charity?’ he asks when I speak to him.

‘The money Huisman sent to the charity. We talked about you finding out more about it? Remember?’

‘Yeah, I remember now. Got sidetracked. You still want me to look into it?’

I tell him I do want him to look into it. Preferably right now. I put the phone down to find Vermeer looking at me.

‘You okay?’ she asks.

‘Fine.’

‘You’ll tell me if you’re not, right?’

‘I will.’

She takes a few moments as if to assess whether she can trust me or not, then seems to come to a decision.

‘All right, got something for you. We’ve not yet spoken to the chief operating officer at Marianne Kleine’s start-up, but given how stuck we are I think it’s probably worth doing. You up for it?’

‘Sure, when are we going?’

‘We’re not, you are. I’ve got a few things to do. Here are the details.’ She hands across a sheet of paper. She pauses at the door, looks on the verge of saying something, but then leaves.

With the meeting set up in half an hour I’m quickly going through what I can find on Kleine’s start-up when Roemers calls back.

‘Not much to report. Whoever set up the charity did it in such a way that it’s hard to find out anything about it. The only concrete thing I’ve got so far is their correspondence address, which is a PO box. Anything else is gonna take quite a while to unpick.’

‘There’s no phone number? No way to contact them?’

‘Only thing I can find is the PO box.’

We seem further than ever from finding Huisman, and this is pretty much all we’ve got. I tell him to do it. He sighs and tells me there’s no way he has the time or resources.

‘Where’s the PO box?’

‘Why, you gonna stake it out?’

‘No. I’m not.’

But Jansen is. At least that’s my plan. He doesn’t sound thrilled when I swing the idea past him. He suggests a uniform instead. I tell him to do whatever he needs to do. He agrees, and leaves to sort it out.