Lewis Shaler is a doctor and single father heading home with his young son Max on a late night train from London. Max accidentally causes fellow passenger Sarah Barwell  to spill coffee on her coat, prompting Shaler to apologize to Barwell. The interaction is the beginning of a romantic connection between the two. Unexpectedly, the train has break-down as close to the final station. All train driver and staffs were down, there are only last few passengers on the train- one of them is Shaler. They have to find out the way to escape the train is moving with high speeds and having no brake.