The Third Day is a drama-thriller television series created by Felix Barrett and Dennis Kelly for HBO and Sky Atlantic.

The third part of the series, "Winter", directed by Philippa Lowthorpe, follows Helen (played by Naomie Harris), a strong-willed outsider who comes to the island seeking answers but whose arrival precipitates a fractious battle to decide its fate.

[19][20] Naomie Harris and John Dagleish were added in August, with Philippa Lowthorpe hired to direct the final three episodes of the series.

[23] Production visited many locations in Kent for filming, including Fog Signal Station at Dungeness, Allens Farm, Harty Ferry Road near Harty Ferry Inn in Swale, Walpole Bay Tidal Pool, St Clere Estate, Bedgebury National Pinetum Forest, Hever Castle, Grain Coastal Park on the Isle of Grain, Chislehurst Caves and Shellness Beach on the Isle of Sheppey.

The website's critics consensus reads, "With a sufficiently arresting atmosphere and captivating performances from stars Jude Law and Naomie Harris, The Third Day is an intriguing—if overly familiar—addition to the folk-horror genre.