Henry is a player skilled at seducing women. But when this veterinarian meets Lucy, a girl with a quirky problem when it comes to total recall, he realizes it's possible to fall in love all over again…and again, and again. That's because the delightful Lucy has no short-term memory, so Henry must woo her day after day until he finally sweeps her off her feet.

Leonard Shelby is tracking down the man who raped and murdered his wife. The difficulty of locating his wife's killer, however, is compounded by the fact that he suffers from a rare, untreatable form of short-term memory loss. Although he can recall details of life before his accident, Leonard cannot remember what happened fifteen minutes ago, where he's going, or why.