Chris (Joseph Gordon-Levitt), a star hockey player, has the world at his feet. Then a devastating car accident turns his life upside down. Suffering from a brain injury that leaves him with lasting mental impairments, including anterograde amnesia, he takes a job as a bank janitor and must write everything down in a small notepad to compensate for his inability to remember how to complete daily tasks. He soon becomes the target of an unscrupulous gang, who are planning a heist at the bank.