Julian Fellowes

In Agatha Christie's most twisted tale, a spy-turned-private-detective is lured by his former lover to catch her grandfather's murderer before Scotland Yard exposes dark family secrets.

The beloved characters of Downton Abbey take to the big screen, and it turns out that they've got a major event to prepare for. After all, it's not every day that royalty makes an appearance. Of course, it's not long before tensions are running high. The property isn't even close to ready when it becomes clear that Carson the butler will need to come out of retirement to help run this sinking ship before it's too late.