This is a recap of Part 1, episode 1, The Father, which includes full details of the plot. My non-spoilery review of the season is HERE.
The Third Day takes place in a remote part of the UK, on an island that’s cut off from the mainland for most of the day. Osea Island is accessible by car for only a few hours a day at low tide by driving across an ancient Roman causeway that floods when the tide rises. It’s inhabited by a small community of year round residents who have their own traditions and beliefs which blend the old Celtic religion with Christianity.
Sam (Jude Law), a grieving father, stumbles into this community accidentally after saving the life of a young woman from Osea. He feels a connection to the community that he doesn’t understand, but also a sense of chaotic urgency as various obstacles prevent him from leaving the island and returning to his own troubled life.
Osea Island is a real island off the coast of Essex which takes on a life of its own in the story. The characters seem to travel over every inch of this tiny paradise as the show progresses through summer, autumn and winter. This allows viewers to get to know Osea’s tempestuous personality and beauty up close and to get a sense of how its natural elements affect the direction of the community.