Anna's POV:

The sound reaches me before I understand what it is.

Engines. The crack of something — wood, glass, I can't tell — and then voices, urgent and overlapping, and underneath all of it a sound that is not human and not exactly animal, the kind of sound that moves through walls and travels straight to the part of me that knows what it means before the rest of me catches up.

'That's him,' Nicole says.

The door hits the ...