FIRST LOOK - Watch All-New Clip from DOWNTON ABBEY Season 4

Downton Abbey returns to PBS on Sunday, Jan. 5 at 9 p.m. ET/PT. Click here for a sneak peek of the premiere episode!

In the clip, the staff discusses the sudden departure of O'Brien's (played by Siobhan Finneran) from the estate. According to the servants, "she skulked off like a thief in the night" leaving them and Countess Lady Cora in the lurch.

On the Season 4 of the historical drama, Emmy, Golden Globe and SAG award-winner Paul Giamatti (John Adams, Sideways, Barney's Version, Cinderella Man) will join the cast portraying Cora's maverick, playboy brother Harold, starring alongside the iconic Shirley MacLaine and the regular cast members.

Downton Abbey is a Carnival/Masterpiece Co-production. It is written and created by Julian Fellowes. Gareth Neame and Julian Fellowes are Executive Producers.

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