Assassins Anonymous, Rob Hart

Mark was ‘The Pale Horse’ a real-lifeJohn Wick, his god-like status a drug; until he quit and joined a twelve stepprogram in New York City for recovering assassins.

He’s nearing his first year of nonlethality when the past comes calling. Now he has to bounce from Singapore toLondon and back to home whilst attempting to find out who wants him dead and withoutkilling anybody else in the process.

Will he slip?
Note - this thing moves like an express train and the reason for Mark entering AA is truly heart breaking. Also you'll learn box breathing - which is a very useful skill.