Cam had tried to explain. It wasn’t the first time for him. It had been Emmy who’d discovered it, back when she had been newly turned Silver. She’d taken down a crowd as big as a city with that vaccine, turning one Weeper human, then watching the chain reaction as its neighbours bit it, then were bitten themselves, each one dying in turn as their human bodies were returned to them, unable to survive the transition from their Weeper selves. And now it was happening again in miniature, only this time the vaccine had been contained in a living body. A contaminated human body. The bait.

