Episode 4 of "Secrets We Keep" unfolds with the dawn breaking over Mike's vigilant workout routine, his muscular form silhouetted against the morning light as Cecilie watches him intently from the sanctuary of their bedroom window. Upon his exertions ceasing, she steps forward, confronting him head-on about his enigmatic connection with Ruby. Mike, with a hint of challenge in his voice, inquires if she harbors jealousy and steadfastly denies any awareness of Ruby's pregnancy, branding her suspicions as the ravings of madness.
Elsewhere, Aicha's investigation intensifies, her focus narrowing in on the locality where Ruby's abandoned bag was discovered. At school, amidst the humdrum of daily academics, Rasmus and Mike engage in a hushed conversation, the tension palpable as Rasmus directly queries Mike on whether he is withholding truths. Mike, feigning ignorance, asserts his own bewilderment. Meanwhile, Oscar captivates Viggo with a haunting video on his phone; the audio track, a chilling symphony of a woman's sorrowful sobs interspersed with another's deep, labored moans, visibly disturbs Viggo.
Aicha delves deeper into Ruby's possessions, her eyes lighting upon a parking pass from an opulent hotel. In tandem with Carl, they traverse to the hotel, where a member of the staff recognizes Ruby's visage. He reveals that she had recently frequented the establishment, accompanied by a man at the helm of a Porsche Taycan Turbo. A swift investigation unveils Mike as the driver, his past marred by a conviction for raping a woman a quarter-century ago.
Back at their residence, Oscar persists in his surreptitious surveillance of Cecilie, employing his drone as his silent sentinel. Meanwhile, Angel seeks solace in the comforting embrace of her fellow Filipino friends at church, the sanctity of the space offering a brief respite from the stormy waters of her life.
They resolve to assemble a search squad in the vicinity where Ruby's purse was discovered, their collective frustration evident as they feel abandoned by the police. Angel later conveys this plan to Cecilie, who readily agrees to grant her a day's respite and lend a hand in organizing the search efforts.
Meanwhile, back at their home, Oscar's behavior remains suspiciously odd. Elsewhere, Viggo is engrossed in watching a distressing video depicting men denigrating a woman. He then requests Cecilie to ask Angel to tuck him in, but his mother firmly declines. The subsequent morning, Viggo wets his bed and seeks Cecilie's assistance. With Angel preoccupied with planning the search party, Cecilie drops Viggo off at school.
At the school, fate brings Cecilie face-to-face with Katarina. After updating Katarina on the search party, they decide to attend together. Aicha also joins the search party and once again engages in conversation with the Father. This time, he reveals a heart-wrenching truth: Ruby had been raped and feared she might be pregnant. However, Ruby never disclosed the identity of her assailant. Moreover, she was against terminating the pregnancy, prompting the Father to suggest she confront her rapist. Regrettably, the search party yields no tangible results.
The following morning, Angel is haunted by a vivid dream about Ruby. As she walks Viggo to school later, she notices his subdued demeanor.
Upon the disturbing revelation, Aicha's suspicions hone in sharply on Mike, branding him as the prime suspect. Carl promptly指令s Aicha to engage Cecilie in conversation, seeking any insight into Mike's whereabouts on the fateful night Ruby vanished.
Cecilie, perceiving Aicha's intensifying focus on Mike, raises his past conviction for rape, attempting to rationalize his actions and fabricates a tale, claiming Mike returned home shortly after Katarina, Ruby, and Oscar had departed for the evening.
Later, the tension escalates as Cecilie confronts Mike at their shared abode. He tries to clarify, insisting that his intentions were solely to assist Ruby in obtaining her driving license. She persists, demanding to know his exact location on the night Ruby disappeared. Mike stands firm, affirming he was at work and subsequently stayed at a hotel. Unconvinced, Cecilie prepares for her morning jog, exiting the premises shortly thereafter.
Meanwhile, Aicha receives urgent news: a body matching Ruby's description has been discovered at the marina. With heart pounding, she speeds to the scene, where the figure in the water is clad in a red jumper and blue jeans—precisely what Ruby was last seen wearing.
As Cecilie runs, she can't help but notice the influx of police cars converging in a single direction, the gravity of the situation dawning on her. The episode culminates in a haunting image: Ruby's eyes slowly closing as the wind caresses her face, only to be succeeded by the harrowing sight of a lifeless body drifting in the water, a stark testament to the unfolding tragedy.
