In the gripping third episode of "A Murder at the End of the World," titled "Survivors," the mystery deepens as Darby Hart (Emma Corrin) continues her relentless pursuit of the truth behind Bill's murder. The episode, which aired on Hulu in the US and Disney Plus in the UK on November 21, sees Darby grappling with the enigmatic masked figure and the secrets of the guests at the Icelandic retreat.

The episode begins with a flashback to Darby and Bill (Harris Dickinson) several years prior, as they investigate the Silver Doe killer. This scene sets the tone for the present-day narrative, where Darby is haunted by the footage of a mysterious figure in a mask who visited Bill just before his death. The mask, designed to evade AI facial recognition, suggests that the killer is someone with intimate knowledge of the hotel's software— effectively narrowing down the list of suspects to almost everyone at the retreat.
Darby's suspicion is piqued when she sees the masked figure leaving the hotel and follows it into the wilderness. The figure sends a chilling Morse code message: "One Down Still A Go," indicating that there is more to this murder than meets the eye, and that the killer has a larger plan in motion. The response from a distant source adds to the intrigue, suggesting a network or accomplice involved in the crime.
Darby's investigation takes a turn when she uses the AI assistant Ray to scan the internet for connections between Bill and the guests. She finds links in most cases, but there's nothing for Andy, and all records of Rohan post-2006 are missing. This discovery leads Darby to believe that Rohan might be the masked figure, especially when she later finds him wearing brown walking boots with red laces, matching the description of the figure's footwear.
During a group hike through Iceland, Darby confronts Rohan about his past and his relationship with Bill. Rohan admits that Bill saved him from alcoholism, but he has since relapsed. Despite Darby's probing, Rohan insists he would never hurt Bill and urges her to drop the investigation.
The tension escalates when Darby is confronted by Andy Ronson (Clive Owen), who demands she leave the hotel due to her persistent investigation, which he believes is unfounded. Andy takes Darby's access ring and confines her to her room, intending to have her removed from the premises. However, Darby's determination to solve the case does not waver. She leaves a message for Andy, asserting her intention to keep her room, and then proceeds to Rohan's room. Before she can speak with him, Rohan is found dead in the dining room, collapsing under mysterious circumstances.
As the episode draws to a close, Darby is left with more questions than answers. The death of Rohan suggests that the killer is closer than she thought and is willing to eliminate anyone who gets too close to the truth. The urgent situation forces Darby to reevaluate her approach and consider the possibility that the killer may be someone she has yet to suspect.
The episode ends with Andy ordering everyone to take shelter, indicating that the danger is far from over. The chilling final moments leave viewers on the edge of their seats, eager to see how Darby will navigate the increasingly treacherous landscape of the retreat and uncover the identity of the masked figure before another life is lost.
"Survivors" is a masterclass in suspense and intrigue, deftly weaving together past and present narratives to create a compelling mystery that keeps viewers guessing. With each new revelation, the stakes are raised, and the web of deceit surrounding Bill's murder becomes ever more tangled. As the series progresses, it's clear that no one is above suspicion, and the truth may be more complex than Darby could have ever imagined.