The sirens split the afternoon just after Aileen's class let out. Phones buzzed. Students murmured. A traffic alert popped up on the screens in the student center: **BREAKING: Convoy Collision on Highway 12. Injured: Richard Lowe, CEO of Lowe Global.** Aileen stared at the headline, numb. Mina nudged her. “Isn't that… Paulina's father?" “I think so." “Yikes. Wonder if she even cares." Aileen didn't answer. Her own phone chimed. A number she didn't recognize. **“We're reaching out from Midtown General. You registered as a rare blood donor—O Rh-null. We have a patient in critical condition. Can you come in immediately?"** She didn't hesitate. --- At the hospital, the air smelled like bleach and urgency. Aileen rolled up her sleeve as the nurse tapped her vein. “Do I know who it'

