Just when we thought we were getting to the bottom of some of the Osea islanders’ secretive ways, episode four of The Third Day presents us with a whole new load of mysteries to unpick.

Despite Sam taking on the role of the island’s “father” at the end of episode 3 (a duty we saw him ‘earn’ through a series of gruelling trials during the ‘Autumn’ live event at the weekend), he’s now nowhere to be found. Instead, episode 4 sees the arrival of a brand-new protagonist in the form of Helen (Naomie Harris) and her two daughters, Ellie (Nico Parker) and Tallulah (Charlotte Gairdner-Mill).

Osea certainly looks like it’s seen better days at this point. Gone is the excitement and buzz of the summer months – as Helen drives onto Osea, it appears practically deserted, except for the weird cult-like drawings which have been painted on buildings around the island and the odd islander who seems less-than-pleased to see her.

The Third Day episode 4: who is Helen, and why has she come to Osea?