As Joe and three fellow rescuers scramble to secure the fallen balloon, a sudden gust of wind propels them into the sky. In the midst of the chaos, one of their team members is swept away, plummeting to a tragic fate while they watch in horror. The trauma from that harrowing day resurfaces during a dinner with friends, including Robin, Rachel, and Claire, where Joe's tormented mind bears the scars of that disastrous incident.
Miraculously, the balloon lands safely, and its young occupant is unharmed. However, for Joe, the memory of the man who fell becomes a haunting presence, lurking in the corners of his mind. Later, he teams up with fellow rescuer Jed Parry (played by Rhys Ifans) to retrieve the body of the deceased, feeling an inexplicable pull towards Jed's compassionate nature.
As the weeks drag on, Joe becomes increasingly trapped in a web of guilt and self-blame, replaying hypothetical situations in a frantic effort to absolve himself. It is during this agonizing time that Jed reaches out, calling Joe with an urgent invitation to discuss their shared ordeal. Although hesitant, Joe cannot resist Jed's offer to cease contact if he agrees to meet.
Their first encounter leaves Joe feeling uneasy, as he senses a depth behind Jed's gentle demeanor. The meeting concludes with a lingering discomfort, amplifying Joe's internal turmoil over that catastrophic day in the field.
Joe soon finds himself ensnared in the life of the deceased man's widow, who drops a disturbing revelation: there might have been infidelity looming before her husband's tragic end. Authorities had recovered a picnic basket—with an unknown woman’s scarf—from his car, igniting Joe's quest for the truth and justice.
The impact of that man's death becomes a pivotal moment for Joe, thrusting him into a journey filled with moral quandaries and uncertainty. As he digs deeper into the mystery surrounding the fallen hero, Joe's very identity begins to unravel, threatening to engulf him.
As Joe's obsession with the balloon incident intensifies, his personal life starts to deteriorate. Jed's intrusive appearances further blur the lines between their lives. His tendency to show up unannounced at Joe's home, workplace, or even leisure activities strains Joe's relationships, particularly with Claire. Joe’s increasingly erratic behavior culminates in a late-night confrontation that ultimately leads Claire to end their relationship.
Enraged and despondent, Joe confronts Jed, but their argument spirals into chaos when Jed sustains a brutal beating against his own wall. In an attempt to drown his misery, Joe seeks refuge at Robin and Rachel's house, spending the night in despair.
The following morning, Joe learns that Claire has been trying to contact him while Jed is at her home. He rushes back only to stumble upon a shocking scene: Jed and Claire are together on the sofa, Jed displaying visible signs of aggression and wrongfully accusing Joe of the attack.
Joe's anger reaches a boiling point as he watches in horror as Jed suddenly plunges a kitchen knife into Claire, leaving her bleeding on the floor. In a moment of deception, Joe pretends to accept Jed and they share a grotesque kiss before Joe seizes the knife from Jed and retaliates violently.
Once the dust settles, Joe rushes to help Claire and calls for medical assistance before returning to the scene of the initial balloon incident, where he encounters the grieving widow and daughter of the man who perished. A chance meeting with a friendly couple reveals that the picnic basket and scarf belonged to them, a token from their own affair. This revelation adds a new layer of complexity to Joe's quest for understanding.
In the wake of his actions, Joe revisits the site where it all began, alongside Claire, who now needs a cane as a symbol of her physical and emotional recovery. As they attempt to recreate their unrealized picnic, Joe searches for the right words to express his emotions, praying for her forgiveness and the chance to mend their fractured relationship.
As the story reaches its conclusion, an unsettling yet captivating twist emerges, drawing viewers from the whimsical dreamscape back into a stark psychiatric hospital. Here, Jed (played by Rhys Ifans) appears very much alive, fixated on a blank page as he scribbles away with a pen. The camera lingers on his composed demeanor, and his slight smile reflects the profound effects this tumultuous story has imprinted on his mind.
