In the third installment of Prime Video's "Mr. & Mrs. Smith," titled "First Vacation," John and Jane Smith embark on a seemingly idyllic honeymoon to the Italian Dolomites, only to find themselves entangled in a mission that mirrors their own relationship's complexities. Tasked with spying on a bickering couple, Gavol and Parker Martin, the Smiths must navigate personal and professional challenges amidst the picturesque Alps.

The episode commences with their enigmatic handler, Hihi, outlining their latest assignment. John and Jane are to stay at the Fanes Hotel, conveniently located next to their targets. Their objective is to bug the Martins' phones in anticipation of a crucial call, all while reporting on the couple's interactions.
Equipped with a monitor to observe the Martins, John and Jane settle into their cozy hotel room, complete with champagne. As they eavesdrop on the Martins' arguments, they are prompted to discuss their own sleeping arrangements, a topic that highlights the evolving nature of their relationship.
The night takes a turn when Jane, alerted by a noise, initiates a sweep of their room, finding nothing out of the ordinary. This incident foreshadows the tension and unease that will permeate their mission. The following morning, over breakfast, John and Jane witness the Martins' strained relationship firsthand. A minor disagreement over table manners escalates into a debate about bugging the Martins' devices, with Jane insisting on separate approaches to avoid drawing attention.
As they tail the Martins onto the ski lift, John confesses his inability to ski, a revelation that adds levity to the tension. A more serious conversation ensues about John's secret phone calls with his mother, a breach of their agreement to cut all ties. Jane's anger at this betrayal is palpable, as it jeopardizes their safety and mission.
The chase continues at a Christmas market, where John and Jane are delayed by an elderly couple from the hotel. Jane's frustration boils over, leading to a threat that underscores the high stakes of their operation.
In a café, the Martins' marital strife is on full display, paralleling John and Jane's own discord. Jane confronts John about his phone calls, questioning his commitment to their new life together. The mission takes a dramatic turn when Gavol is kidnapped, forcing John and Jane to record the ransom call. Against Jane's advice, John intervenes, managing to free Gavol but getting pinned down in the process.
Jane's rescue of John, followed by a heartfelt conversation in their hotel room, marks a turning point in their relationship. The episode concludes with the couple sharing a bed on the train home, symbolizing the deepening of their relationship and their mutual dependence.
"First Vacation" is a pivotal episode that delves into the personal lives of John and Jane Smith, using their mission as a backdrop to explore the intricacies of their relationship. The episode masterfully blends humor, suspense, and emotional depth, providing a rich narrative that keeps viewers engaged and invested in the Smiths' journey.