"Secrets That We Keep" is the 464th episode of Casualty and the 18th episode of the 19th series. It was preceded by "Casualty@Holby City - Part One" and followed by "Fathers, Mothers, Daughters, Brothers". The episode was directed by Chris Lovett and written by David Robertson. The events of this episode take place the day before the airdate, on 31 December 2004.
Harry tries to raise morale on the ward following Jim's death and Abs manages to break down Nina's defences when they are forced to treat a patient together. Ellen receives unwelcome news about her visa, Bex struggles to deal with Selena's constant bullying and Claire comes up with a solution to Comfort's legal woes.