Two men awaken to find themselves on the opposite sides of a dead body, each with specific instructions to kill the other or face consequences. These two are the latest victims of the Jigsaw Killer.
Leonard Shelby, an insurance investigator, suffers from anterograde amnesia and uses notes and tattoos to hunt for the man he thinks killed his wife, which is the last thing he remembers.
Four friends/fledgling entrepreneurs, knowing that there's something bigger and more innovative than the different error-checking devices they've built, wrestle over their new invention.
Hint: The password should be at least eight characters long. To make it stronger, use upper and lower case letters, numbers, and symbols like ! " ? $ % ^ & ).