The story, originally published in The Magazine of Fantasy and Science Fiction in 1966, is a futuristic tale about Douglas Quail who wishes to visit the Mars colony. Unable to actually afford to he visits REKAL, a company specializing in implanting fake memories as a sort of virtual adventure.
Things turn dangerous for Quail when it turns out his planned fake trip to Mars as a secret agent may have actually already happened in real life.
A second adaptation of he book, Total Recall (2012), was also released starring Colin Farrell and Kate Beckinsale. Don't watch either movie expecting a page by page adaptation. Both films keep to the main premise of the short-story, but, of course, they make changes the way that movie adaptions seem to do.
Covers courtesy of LibraryThing.