Granville tries to put the magic back into Christmas, but things don’t always go according to plan and people keep disappearing. Still, the nation's favourite grocer might have one last trick he can perform successfully if he can find a glamorous assistant. Eric and Cyril try to persuade their wives to try Arkwright's special French custard, and Mr Newbold 'accidentally' bumps into Mrs Rossi at the café. She invites him to Christmas lunch, but will the Black Widow throw the book at him when she finds out?