Night Watch

Ellen faked witnessing murders to create a cover for killing John and Sarah. By claiming to see phantom killings and repeatedly calling the police about the old house, she exhausted police resources and made any future investigation seem like another hallucination. This elaborate scheme allowed her to murder her husband and his lover without immediate suspicion.

Earlier scenes show Ellen's insistence on the alleged murders despite no evidence, which appears to be paranoia but is actually calculated planning.

Ellen planted the bodies during the storm when she could operate undetected. She used the chaos of the thunderstorm to move the bodies from wherever she had concealed them (likely after killing them elsewhere) into the old house, positioning them in the second-floor room exactly as she would later claim to have seen them.

The freshly planted Laburnum bed that appeared overnight suggests Ellen used the storm cover to dig and bury evidence while working on her plan.

DIPCO was a private company that John used to purchase the old house six months before the main events. He acquired it secretly, and Ellen discovered this when signing financial documents. The purchase suggests John had been planning something with the property, possibly as a meeting place for his affair with Sarah or as part of a larger scheme involving Ellen.

John's insistence that Ellen sign documents granting him power of attorney before her trip reveals his hidden financial manipulations.

Ellen agreed to go to Switzerland for psychiatric treatment as part of her murder scheme. By voluntarily committing to treatment, she established what appeared to be a legitimate reason to leave town, making her absence after the murders seem natural and providing cover for her escape.

Tony's recommendation for Switzerland comes right after Ellen's second claim of seeing a body, reinforcing that her 'mental breakdown' was being believed.

Mr. Appleby's father previously owned John and Ellen's house before they purchased it. This connection explains his willingness to assist Ellen, he has some familiarity with the property and its history. After the murders, he congratulates Ellen on pulling off the scheme and promises not to report the murders because he knows Inspector Walker would never believe him.

Mr. Appleby refuses to let police dig up his newly planted trees, providing Ellen the time she needed to complete her plan.

Ellen discovered John was having an affair with her friend Sarah. This betrayal, combined with her trauma from her first husband's death in a car accident with his lover, motivated her to plan a calculated revenge. She used her knowledge of the old house and orchestrated an elaborate false narrative to murder them both while appearing insane.

Sarah's skepticism about Ellen's 'seeing things' reflects the tension in their friendship, which was actually built on betrayal.

Ellen possessed a key to the old house, which she reveals when confronting John and Sarah about their affair. She uses this key to enter the house and lure them to the second-floor room where she carries out the murders. The key implies she had been planning the scheme for some time, likely when she discovered John's DIPCO purchase.

The key is never explicitly explained but suggests Ellen had access to the property before the events began, supporting the theory she killed John and Sarah elsewhere first.

Carl's death in a car accident with his young paramour haunts Ellen psychologically and provides backstory for her fragile mental state. The trauma of losing her first husband to infidelity, combined with recurring nightmares of the accident, explains why she was vulnerable to a breakdown and why she might fixate on John's potential infidelity. This history also makes her eventual cold calculation even more chilling, she knows exactly how affairs end.

Ellen's recurring nightmares of Carl's accident hint at her obsession with infidelity and betrayal.

Inspector Walker closed the case because multiple searches found no evidence of crimes. Ellen's repeated phone calls and insistence on impossible scenarios (claiming to see murders that left no bodies) made her appear unstable. Walker privately told John the case was closed, and his revelation about DIPCO ownership came only when Ellen pressed him again, showing he had moved on from what he perceived as a mentally ill woman's delusions.

The police arrest Mr. Appleby for trespassing during the second sighting, showing they are investigating but finding nothing criminal.

At the end, Ellen successfully murders John and Sarah in the old house, positioning their bodies exactly as she claimed to have seen them. She leaves for Switzerland with Mr. Appleby promising to watch her house and garden. The film ends bleakly with the murderer escaping justice, the police believe Ellen is a grieving widow traumatized by her husband's murder, not his killer.

The final scene mirrors Ellen's initial sighting, with bodies positioned identically, confirming her elaborate setup.