Two corners, three, it's still on them, four, six, nine. Then Vik stumbles, trips, scuffs across the floor. When he picks himself up, his fibrous face mask is torn and shredded.

The doorbell rings.

"Hello? Anybody home?"

A woman's voice. Well-spoken, which worries me; in this area, anyone with an education is some kind of official.

I'm lying on the sofa and my mind's fluttering back and forth, settling on memories from before Shaun got ill.