What’s the story behind Payback?

My maiden novel is called Payback.  It is a pacey revenge thriller which drew heavily on my own life experiences. Geoff Summers, a brilliant designer of electronic control systems for a company that makes anti-burglar equipment, becomes a cold, ruthless criminal when his vindictive new managing director prevents him from fulfilling his wife’s dying wish. The plot also follows Jim Warwick, a wealthy motor trader who is also a dealer in drugs. Sparks fly on the night that Warwick is cornered by the police and Geoff is at Warwick’s house with a gang of burglars.