Nelson, portrayed by Kiefer Sutherland, embarks on a dangerous journey with four of his fellow medical school colleagues: Joe Hurley, played by William Baldwin, David Labraccio, expertly brought to life by Kevin Bacon, Randall Steckle, enacted by Oliver Platt, and the compassionate Rachel Manus, depicted by Julia Roberts. Their mission? To unveil the mysteries that lie beyond the veil of death itself. Nelson, enthused by accounts from individuals who successfully navigated near-death experiences filled with vivid visions, sets up his experiment in an old, deserted building, complete with all the necessary medical apparatus.
Initially skeptical, Steckle gradually succumbs to the magnetic pull of Nelson's audacious plan. Meanwhile, David harbors unspoken feelings for Rachel, who, unfortunately, is oblivious to his affections. Following a suspension due to an unapproved emergency procedure, David finds himself drawn into Nelson’s risky endeavor, as all of them do, driven by a potent mix of scientific inquiry and an insatiable thirst for knowledge.
The team's strategy is chillingly simple: they will cool the body down and issue a powerful electric shock to halt the heart. Their courageous revival attempt is meticulously timed to commence exactly one minute after the heart ceases to beat. In a harrowing moment, Nelson flat-lines for this crucial minute before his friends battle to bring him back to life. During this time in the afterworld, he is haunted by the ghost of Billy Mahoney, a boy he mercilessly bullied in his past. When pressed to describe his experience, Nelson can only murmur that he glimpsed something extraordinary, though every attempt to articulate it proves elusive.
This taste of the unknown begets a swell of curiosity in his companions, spurring them to follow in his footsteps to uncover what they can discover for themselves. Joe, next in line, seeks to push the limits and opts to flat-line for an ambitious 90 seconds, during which he encounters an electrifying afterlife sequence that leaves him convinced of the existence of a higher plane, affirming everything Nelson has claimed.
In a twist of competition, David and Rachel engage in a playful rivalry over who can endure death the longest before being revived, with David setting a lofty bid of 140 seconds. As David slips into the abyss, he is confronted by haunting visions of Winnie Hicks, an African American girl he had bullied, who eerily reminds him of his past misdeeds. Each of the men begins to face their own unique and tormenting hallucinations, all rooted deeply in their personal histories and regrets. Nelson's manifestations become increasingly terrifying, as he finds himself relentlessly attacked by Billy Mahoney, emerging daily with new wounds that reflect his troubled conscience.
Joe, who has an impending marriage, grapples with the distressing revelations of videos he's kept hidden, serving as a painful reminder of his betrayals during their engagement. Meanwhile, Rachel, anxious to share in this groundbreaking experience, insists on taking her turn to flat-line. However, as the group initiates this next daring feat, David's apprehensions increase; driven by the turmoil within, he races to intervene, but tragically arrives too late. Rachel teeters on the brink of disaster when a power outage disrupts their ability to revive her, yet with immense effort, they manage to bring her back from the precipice.
When Rachel awakens, she confronts haunting memories of her father's suicide during her childhood, burdens that have lingered in the recesses of her mind. As tensions mount around them, the men engage in a cathartic sharing of their traumatic experiences, culminating in David's decision to confront his past wrongs directly. He embarks on a quest to find Winnie Hicks, seeking her forgiveness and rectifying the pain he caused her in his youth. After a heartfelt encounter, he feels an unexpected sense of relief wash over him.
However, as David tends to his emotional scars, Nelson, who accompanies him, finds himself alone and ensnared by the vengeful spirit of Billy Mahoney. In a dramatic confrontation, Billy attacks Nelson, but David arrives just in the nick of time, dispelling the haunting imagery before serious harm befalls his friend. Meanwhile, Joe's reality spirals as his fiancée, Anne, discovers his betrayals and breaks off their engagement, leaving him to confront the aftermath of his actions.
In a moment of vulnerability, Rachel seeks solace in David's embrace, sharing an intimate night together that breathes new life into both of their struggles. With Nelson grappling with his own demons, he reveals a startling secret to Joe and Steckle: their collective childhood misdeed led to Billy Mahoney's tragic death. This revelation prompts Nelson to embark on a path of atonement, yet he chooses to venture out alone.
Realizing the depth of Nelson's turmoil, Rachel and the others rush to save him from his own ill-fated decision to flat-line yet again. They reach him long after the critical window of time has closed. In the ethereal realm of the afterlife, young Nelson and Billy Mahoney switch places, enduring the torment of youth before culminating in a moment of self-realization. Just before he hits the ground, he morphs back into his older self and finds peace as Billy walks toward a radiant light.
Desperate, David delivers one final jolt, leading to a miraculous revival. Upon regaining consciousness, Nelson utters a hauntingly poignant line: > "Today wasn't a good day to die." This encapsulates the profound experiences they have endured and the heavy weight of the choices they made - somewhere between life and the enigmatic silence of the grave.
