In a lot of ways, "Inception" tells the story of a man with one simple driving force. He just wants to go home. He just wants to see his children again. Cobb, played with subtlety and grace by Leonardo DiCaprio, is a lot like Dorothy in the Wizard of Oz. Not that there are any plot similarities, mind you, but Cobb desperately needs a pair of red shoes to click together. Cobb is an extractor, the best in the business, but he is also a fugitive on the run. He uses a technology called dream sharing, where he is able to infiltrate the mind of a subject and find out all their secrets.
This technology, and extractors like Cobb, have become invaluable in a world filled with corporate espionage. The process by which Cobb breaks into the subject's subconscious and steals their secrets is called extraction. However, a wealthy corporate CEO named Saito asks Cobb to perform inception, the process of planting and idea rather than stealing one, on one of his competitors. Cobb's right hand man, Arthur, insists this is impossible, that true inspiration cannot be faked.