The young woman who’d just died in the county hospital illustrated the point: no one had any idea she even had tuberculosis until she was on her deathbed. She’d had a husband and children; she’d lived in a crowded neighborhood; she’d worked inside a massive open-plan office, alongside three hundred other people. If the TB had reached her lungs, anyone she’d been anywhere near was now in mortal danger. That was Charity Dean’s immediate problem: to figure out who, if anyone, might be infected.
