The film chronicles the thrilling escapades of Roy Miller (Tom Cruise), a spy in flight from danger, alongside June Havens (Cameron Diaz), a talented car refurbishing expert. Their paths cross in a chaotic sequence at Wichita Airport, where June finds herself in a dilemma as her flight gets overbooked. But, with a twist of fate, Roy, who has secret motives, manages to board the flight and cryptically whispers to her, >"sometimes things happen for a reason." What she doesn’t realize is that Federal agent Fitzgerald (Peter Sarsgaard) is tailing Roy and has put June on high alert, believing she’s part of Roy's game.
Once aboard the aircraft, June is bewildered to see only a handful of passengers. As she enjoys a drink and shares her aspirations of one day driving to Cape Horn, Roy is on high alert, assessing the other passengers. With a charming demeanor, she leaves to freshen up in the restroom. However, her brief respite leads to chaos as Roy is suddenly attacked by the remaining passengers and crew members. Amidst the peril, Roy takes decisive action, ensuring their survival but tragically ending the lives of everyone on board, including the pilots. When June reemerges, Roy calmly informs her of the horrifying truth: they are the only ones left alive on the plane. At first, she assumes he is joking, but the stark reality hits her when she sees the grim aftermath of the turbulence.
After a rough landing on a highway, which veers off into a cornfield to avoid a truck, Roy offers June a drink and advises her that she might face questions from authorities. Cautioning her against entering any vehicles or giving in to offers of "safety," Roy knocks her out gently with a sedative as a precaution. She awakens in her home, surrounded by items that Roy brought to ensure her safety. As she navigates through life, trying on bridesmaid dresses for her sister April (portrayed by Maggie Grace), June faces disheartening news about their father's cherished GTO car.
Caught by apparent FBI agents, who assure her of safety, she is drawn into a web of deceit and questions regarding Roy. Just as uncertainty looms, Roy bursts onto the scene in a dramatic rescue. Torn between trust and confusion, June seeks refuge with her previous boyfriend Rodney (Marc Blucas), but Roy's reappearance leads to yet another kidnapping, which showcases his flawed yet protective instincts. By forcibly involving Rodney and stealing June away, Roy explains the danger they face and the need to recover the missing genius Simon Feck (Paul Dano), the inventor of a groundbreaking energy source known as the Zephyr.
As the journey unfolds, with hidden clues leading them from Brooklyn to Austria, they become embroiled in a perilous cat and mouse game with a sinister arms dealer Antonio (Jordi Mollà). June, manipulated and sometimes losing consciousness due to Roy’s attempts at 'keeping her safe', finds herself in relentless skirmishes that reveal her resilience. She foils an assassination attempt on the train and bravely faces various threats, including a drone aimed at them, while she and Roy's bond becomes increasingly complicated.
In a climactic turn of events filled with unexpected allies and fierce enemies, June learns more about the true nature of both Roy and the Zephyr. Captured and drugged by Antonio’s men, she inadvertently reveals their plans under the influence of serum, leading to all kinds of confrontations and betrayals. Amidst high-speed chases and daring escapes, their relationship deepens, culminating in moments of passion, confessions, and urgent rescues.
As the perilous escapades take a toll, Roy takes a bullet for Simon, but the situation intensifies when the battery—hotter than expected—explodes. Roy’s fate becomes uncertain as he is sent for recovery, only to find a shocking twist when June reappears, catching him off-guard. Their reunion ignites the notion of seizing the day, leading them on a road trip past the alluring signs of Cape Horn, where the adventure began for them both. In a final charming scene, June drives away, hinting that what connects them runs deeper than mere adventure. The film concludes with hope and the anticipation of what the future might hold for Roy and June.
