Laurie, a divorced policewoman,is on a train with her mother Jen,going to hospital for Jen,who has borderline Alzheimer's,to be assessed when the train grinds to a halt. A young Muslim woman has jumped from a bridge under its wheels. With Pat,the driver,traumatised,Laurie and conductor Danny take charge until the Railway Police arrive. Danny gives Jen and Laurie a lift to the h...