Nobody ever talks to strangers on the train. It's a rule. But what would happen if they did?

Every day Iona Iverson travels to work by train. Every day she sees the same people, making assumptions about them, and even giving them nicknames. But they never speak. Obviously.

Then one morning, Smart-But-Sexist-Surbiton chokes on a grape right in front of Iona. Sanjay, a nurse, steps up to help and saves his life.

This single event starts a chain reaction, and an eclectic group of people, with almost nothing in common except their commute, discover that talking to strangers on the train might be uncomfortable and awkward, but it can challenge all of their assumptions and prejudices, and could even transform their life.