The taxi turned onto a narrow street, headlights cutting through the dark. Isabel tried to keep calm, her fingers clenched in her lap. But when she glanced behind them again, her stomach dropped.

The same black car was still there. It hadn’t slowed, hadn’t taken another turn.

“Can you speed up a little?” she asked, her voice tight.

The driver looked uneasy but nodded and pressed the gas.

Her heart thudded faster. The moment the taxi picked up speed, the black car did ...