At the beginning of Revenge of the Sith, General Grievous has kidnapped Palpatine from Coruscant, presumably secretly enabled by the same.
Nevertheless, the chancellor had to come up with some believable chain of events leading to his abduction, since this would be tantamount to abducting the King from Buckingham Palace during WWII, especially Grievous obviously didn't try to be sneaky, at least on the way out.
How did Grievous achieve this?
Canon or Legends explanations are acceptable.
Maybe I wasn't clear, obviously Palpatine orchestrated the whole thing. I'm curious how he faked it, as Grievous had to get from orbit, to the most heavily guarded region of the galactic capital, to the chancellor himself, and then back into orbit.
Palpatine couldn't very well have ordered the entire planetary garrison to stand down and let him be captured.