Henry Roth, a womanising marine-life veterinarian living in Hawaii, meets Lucy Whitmore, an art teacher, in a café one morning. They hit it off and agree to meet in the café the next morning. The following day, however, Lucy seems not to remember anything about Henry and their meeting. The café owner pulls Henry aside and explains that Lucy suffers from amnesia (called 'Goldfield Syndrome' in the movie) as a result of a car accident a year earlier. Her condition has left her with no memory of anything between the day of the accident and the present. At the beginning of each day, she loses all memory of the past day. She innocently believes every day to be October 13, 2002. Her father, Marlin, and brother, Doug, attempt to re-enact the activities of October 13, her father's birthday, every day, for fear that Lucy will be shocked when she knows the truth.
Realizing that he is beginning to fall in love with Lucy, Henry tries many ways to meet her again every day, hoping that one day she will retain her memories - and feelings - for him. Henry and Lucy’s family eventually realize that they cant lie to her about what has happened forever, so they begin to leave video tapes for her to watch each morning, explaining her situation and relationship with Henry. They go on many dates and over time, Lucy begins to reciprocate Henrys feelings, even going so far as to accept his marriage proposal. One morning, however, she overhears Henry telling Marlin that he has canceled his plans to sail to the Arctic on a research expedition - something he had been planning and saving money for 10 years - in order to be with Lucy. Not wanting to be the person to hold him back, she ends the relationship and commits herself to a specialist unit in hospital, allowing herself to forget all about Henry. A heartbroken Henry, meanwhile, finally saves the money needed to begin his trip, and, after a farewell from Marlin and Doug, sets sail. Shortly after departing he