Brilliant computer engineer Michael Jennings routinely has his short term memory erased, so he can't divulge any information about the top secret projects he works on throughout the year. For his most recent gig, he expects to receive over four billion dollars. Upon completion of the job, however, Jennings is given a filled envelope--not with a check for his billions, but containing random objects. It is communicated to him that he had agreed to forfeit his payment for this specific project. With his memory erased, the meticulous engineer attempts to use the objects in the envelope to figure out what happened to him in his now obscured past. Soon, federal agents are after Jennings and he teams up with his old flame, Rachel, who helps him uncover the mystery of his past--and the question behind why the people whom he once worked for, now want him dead.