Midnight Man

Also known as Jack Higgins - Die Lerche fliegt im Morgengrauen, Jack Higgins' Midnight Man

British soldiers force a recently captured IRA terrorist to cooperate with them and then assign him to go undercover with a gang of terrorists and prevent them from killing the U.S. President. But the spy isn't in long before he realizes that the first plot is but a ruse for a more sinister scheme that could result in trouble between China and Great Britain.