New Year's Eve offers a chance for celebration for the staff, but the merriment does not extend to William, as his nightmares over Lord Harry's death continue to torment him, leaving him vulnerable to under-butler Andrew Adams' goading and cruelty, which leads to a terrifying and violent showdown.

• Lucy Gannon
• Tim Whitby

• Orla Brady
• Russell Tovey
• Shaun Parkes