Zinnie continues to keep a watchful eye on a wayward Dr Dan. When his supply of medication runs dry, Dan becomes increasingly agitated and a simple mistake at work leads to serious consequences for a patient. Realising the full extent of his malaise, Zinnie is left with a difficult choice to make between friendship and professional integrity. Meanwhile, DCI Grant attempts to patch things up with DI Donald. Is she serious this time? (thetvdb.com)