The rain in Colombo was relentless that October, turning the streets into mirrors of neon and headlights. Liam had just stepped out of the small graphic design studio where he worked, his messenger bag slung over one shoulder, when he realized he’d forgotten his umbrella again. Typical. He pulled his hood up and made a dash toward the bus stop near Galle Face Green. Halfway there, his foot caught on a loose paving stone and he stumbled forward, nearly colliding with a stranger holding a...