A scientist disappears from a train, a man dies. Harry Palmer (Michael Caine) is one of many investigators on the case, looking for a man named Grantby. He follows a lead to a library where he gets the feeling that something big is at stake here. After a fight with one of Grantby's goons, he returns to his captain with the bad news that he has been unsuccessful. The captain is for obvious reasons, not pleased. In an abandoned warehouse, Palmer finds a small piece of tape with the name IPCRESS on, but at this point in the movie, has no idea what it means, if anything. Later on, though, he le...