As Zoe struggles to come to terms with her new job as clinical lead, a disgruntled Big Mac gets back to work following his heart attack, while Dylan is forced to apologise, as the medical drama continues. Zoe tries to get used to the administrative side of her new role, but when a young girl (Ruby) is brought in to the ED following a car crash and covered in scars from old injuries, Zoe spots an opportunity to do what she loves and misses - treat patients. But as she rushes in to help, can she get to the bottom of Ruby's injuries or does she miss a key clue?!