Every day at 8:05, Iona Iverson boards the train to go to work with the same group of people who she makes assumptions about, even giving them nicknames. As a seasoned commuter, she knows there are rules that everyone should follow:

• You must have a job to go to
• Don't consume hot food
• Always pack for any eventuality
• You must never speak to strangers on the train

But then, one morning, Smart-but-Sexist-Surbiton chokes on a grape right in front of Iona. Suspiciously-Nice-New Malden steps up to help and saves his life, and this one event sparks a chain reaction.

With nothing in common but their commute, an eclectic group of people learn that their assumptions about each other don't match reality. But when Iona's life begins to fall apart, will her new friends be there when she needs them most?