AmnesiA

Detective Constable Mackenzie 'Mac' Stone is haunted by the mysterious disappearance of his wife, Lucia, who vanished three months prior. On the night she disappeared, her last actions included draining their joint bank account and making a cryptic call to Mac from Paris.

Five years earlier, John Dean suffered a car accident that left him with amnesia, erasing his past completely. Now, he is offered £7,000 to participate in a memory restoration trial, but he declines, preferring to embrace his new life and marriage to Jenna.

In his relentless search for Lucia, Mac becomes fixated on John Dean, suspecting he is actually Paul West, an IT professional who supposedly committed suicide. With his partner Ian Reid's support, Mac begins to investigate Dean's background, drawing connections to Lucia's case.

A serious incident occurs at Jenna's yacht design company, prompting Mac to rush to the hospital. In a heated moment, Mac accuses Dean of attempted murder, but the irony unfolds as Dean is injured while trying to protect Jenna from harm.

Reid confides in Dean about Mac's erratic behavior since Lucia's disappearance, suggesting that something deeper might be troubling him. Reid discovers that he is the only one convinced that Dean is West, which raises alarms about Mac's state of mind.

As the investigation continues, Mac experiences waking nightmares, seeing visions of Lucia throughout their home. An anonymous letter questioning his involvement in her disappearance only heightens his anxiety and paranoia, raising doubts about his recollection of events.

Another anonymous letter arrives, accusing Mac of murder, which he chooses to hide from Reid. This letter suggests deeper psychological issues, as it links back to Mac's guilt about the night Lucia disappeared, further complicating the investigation.

As financial issues loom and complications arise in his marriage with Jenna, Dean reluctantly decides to enroll in the memory restoration trial. The results reveal no physical brain damage, challenging the idea that his amnesia was genuine and positioning him in a complicated light.

Reid faces a moral dilemma as he discovers hidden truths about his past involvement with Lucia while investigating Stone. His findings lead him to doubt Stone's innocence while also grappling with his own feelings regarding the case.

An illegal search by Reid's superior, Detective Inspector Brennan, reveals a large bloodstain under the carpet in Mac's home, leading to Mac's arrest for Lucia's murder. Faced with overwhelming evidence, the investigation takes a critical turn.

In a shocking twist, Lucia is discovered alive, revealing that she had been nearby preparing to confront Mac about their tumultuous relationship. She admits to draining the account and that Mac had struck her the night she left, explaining the blood evidence found at his home.

While aboard a client's yacht, Jenna finds a concealed package filled with cash along with new identification documents intended for Dean's escape. This discovery deepens the web of deceit surrounding Dean and adds urgency to their situation.

As Dean attempts to eliminate Jenna to cover his tracks, Mac and Brennan intervene, leading to a tense confrontation. Dean's fate takes a dark turn as he dives into the depths, leaving behind a trail of unanswered questions.

The film concludes with Dean at an undisclosed resort, where he has effectively reinvented himself by assuming Mac's identity. This chilling revelation suggests he is continuing his cycle of manipulation and deceit with another unsuspecting woman.