The Intruder

Catherine and Nick meet at a gallery when a mugger attacks her. Nick intervenes, notices her injuries, and invites her to stay overnight at his apartment. They quickly fall in love and eventually marry, setting the stage for the couple's complicated future.

Three years ago, Stella, Nick's wife, is murdered during an apparent struggle by an unknown intruder. The event leaves Nick emotionally closed off, and Stella's death casts a long shadow over his relationship with Catherine. The past event is a source of tension that resurfaces as the story unfolds.

In the present, Catherine believes someone is sneaking into their apartment and vandalizing her possessions. Evidence repeatedly disappears before she can show it to Nick, who worries she is slipping into Stella's supposed delusions. The mounting distrust strains their marriage.

Catherine discovers Stella's diary and learns that Stella suspected Nick of infidelity. Stella describes in her diary how jealousy drives her to destroy the mistress's possessions, yet the evidence keeps vanishing. This fuels Catherine's fear that Stella may still be alive or that hidden forces are at work.

Catherine confides to Charlie that she thinks Stella may be alive and interacting from the past. Charlie suggests a wormhole could allow Stella to influence events in the present, reframing how they interpret the vandalism and disappearances. The supernatural possibility adds a new layer of mystery.

Catherine reaches out to Stella's twin sister and ex-husband for clues. Both confirm Stella was jealous of an unknown woman, who Catherine begins to realize could be herself. The investigations pull in more people and deepen the enigma surrounding Stella.

Two close associates, Daisy and Charlie, die under suspicious circumstances, suggesting someone is eliminating witnesses or threats. Catherine feels increasingly targeted as the danger closes in. The deaths raise the stakes and push the narrative toward a confrontation.

Facing mounting danger, Catherine borrows Badge's pistol, a new German-made model. The act marks a turning point as she prepares to defend herself and confront potential threats. The pistol's origin becomes a key detail later in the investigation.

Stella's diary resurfaces, now containing a new entry that explicitly threatens Catherine by name. This rekindles Nick's belief in Catherine's account and confirms the danger looming over them. The couple plans to stay somewhere safer.

Nick and Catherine decide to stay at a hotel for safety, and Nick leaves to meet her there. The decision heightens the sense of urgency as they attempt to outpace a threat tethered to Stella's past. The hotel becomes the setting for the next critical moments.

While Catherine packs at the hotel, Stella launches a direct attack with a pair of scissors. After a brief struggle, Catherine shoots Stella in self-defense, ending Stella's immediate threat and changing the dynamic of the case.

Back at the police station, Catherine is booked and about to be evaluated, but she recalls that Badge's pistol can be traced. Investigators discover the weapon was manufactured after the crime, undermining the notion that Stella's ghost could have caused the present-day incident. The revelation supports Catherine's wormhole theory in the eyes of some.

With Catherine cleared, Stella watches Nick and Catherine embrace from a distance, implying the past still haunts the present. The ending hints at unresolved questions linking past and present, leaving a lingering sense of a continuum rather than closure.