Button man

"The world didn't seem to need a man like Harry Exton anymore. An ex-soldier and mercenary, Harry was a human-killing machine without a vocation until an old colleague told him about 'The Game'. The players, known as 'Button Men', are paid to fight to the death in a modern-day gladiatorial contest. Organised by mysterious backers known as 'Voices', the killing game offers bountiful financial rewards... if you live. Harry decides to participate, but soon discovers that death offers the only way out!"--Page 4 of cover.