The film opens with Paige Collins, portrayed by Rachel McAdams, and her husband Leo played by Channing Tatum, leaving a movie theater, enveloped in the romantic thrill of their date night. As they make their way home, a tragic incident unfolds. When they pause at a stop sign, Paige leans over to plant a kiss on Leo. In a heart-stopping moment, their vehicle, a Saab 900, is violently struck from behind by a truck, sending Paige hurtling through the windshield. This accident lands them both in the emergency room and sets the stage for a profound exploration of love, memory, and identity.
As Leo provides an introspective voice-over, revealing how "moments of impact... help in finding who we are," the narrative shifts to recount their love story, illustrating the beautiful journey of how they met, fell in love, and finally wed. However, the blissful recollections are starkly contrasted with the present, where Paige wakes up to a disorienting reality that suggests she has lost a significant portion of her memory. Confusing Leo for her doctor, she grapples with flashes of her past, recalling only fragments like her dream of becoming an artist in high school, yet she is bewildered about her decision to leave law school and break off an engagement.
Once her parents arrive to support her recovery, Leo meets them for the first time, encountering their overwhelming concern. They learn from the doctor that returning to normalcy is crucial for Paige's recovery, yet they are at odds regarding what that normalcy should entail. Leo attempts to fill the gaps in Paige’s memory, revealing that she distanced herself from her family, primarily due to her father’s insistence on pursuing law instead of art. This revelation only deepens Paige's confusion about her choices, including the abrupt end of her engagement with Jeremy.
As the plot unfolds, Paige seeks tangible proof of her marriage and is disheartened when Leo admits he knows little about a diary she had kept. Despite her parents’ desires to take her home, Paige feels an unexplainable bond with Leo and chooses to stay with him for further clarity. This decision ignites a journey of rediscovery, where Paige, unaware of her marriage's history, is gradually reintroduced to the life she once led.
Upon returning home, Paige is met with a surprise party thrown by her friends, a tender attempt at normalcy that ultimately overwhelms her. Struggling to recognize anyone, she retreats emotionally, leading to an outpouring of frustration towards Leo. The next day, donning a hoodie that Leo reveals belongs to him, she starts to navigate the strange waters of her rediscovered life. Despite learning bits and pieces about herself—like her former vegetarian lifestyle—she also finds herself unwittingly bending those rules by indulging in bacon, a bold act of rebellion against her lost identity.
As Paige explores more of her past, she uncovers remnants of her life with Leo, such as a wedding video, fostering confusion and curiosity. A visit to Cafe Mnemonic brings her further into a maze of memories yet to be unlocked. During a family dinner, her mother serves filet mignon, a dish Paige joyously accepts despite Leo’s perplexity over her seemingly contradictory preferences. This dinner highlights the growing strain between Leo’s efforts to help Paige remember and her desire to decode her lost identity, leading to an impulsive kiss with Jeremy that further complicates her feelings.
Meanwhile, Leo’s attempts to rekindle their previous affection, like playful tickling that once characterized their relationship, fall flat as Paige struggles to remember those intimate moments. They visit her art studio, but their plans to stimulate her memories fail when music only provokes a headache instead of inspiration. It becomes evident that the path to rediscovery is fraught with difficulties, further underscored by the doctor’s guidance to confront and embrace the voids in her past rather than retreat from them.
As Paige decides to stay with her parents leading up to her sister's wedding, tensions rise between her and Leo, culminating in him signing divorce papers. After a confrontation with her dad about their financial struggles, Leo finds himself at odds with Paige’s family, leading to an explosive moment with Jeremy. As the narrative progresses, Paige's journey turns inward as she reevaluates the roles her family and Leo played in her life and begins to assert her independence by returning to law school.
In a moment of serendipity, Paige reconnects with her artistic passions, gradually sketching and creating once again, while simultaneously confronting her feelings about her former relationships. As seasons change around them, Leo reflects on the intricate weave of choices and their unpredictable consequences, whispering thoughts of "moments of impact and ripple effects" that resonate throughout the film. The story culminates in a moment of catharsis as Paige discovers the vow she had written, intertwining her past with her present, leading to a poignant realization about love, choice, and self-discovery.
Ultimately, Paige finds herself waiting for Leo at the now-closed Cafe Mnemonic, embarking with him towards a new adventure, symbolizing her willingness to explore new paths instead of clinging to the ghosts of her past, leaving viewers with a hopeful prospect of love and the resilience of the human spirit.
