The Hadrian Memorandum

John Barron was once a top detective in the Los Angeles Police Department's elite 5-2 Squad. A deadly shootout with fellow officers changed his world forever.
Taking a new identity, he fled the country he loved and as Nicholas Marten became a landscape architect in the north of England determined to put a life of violence behind him forever. Then suddenly he found himself in Spain ensnared in a massive global conspiracy where he saved the life of John Henry Harris, the president of the United States. Not long afterward the president came calling again.