Second Wind, Dick Francis

Hardback, 1st UK edition, good condition with yellowing to the pages.

Physics teacher (and crack shot) Jonathan Derry is given some unusual tapes to look after by a friend. They hold a computer programme which functions as a bookie-breaking betting system.
When Jonathan’s friend is killed in a suspicious explosion and two thugs turn up at his house waving guns and demanding the tapes, Jonathan realises that he’s been handed a whole lot more trouble.
Jonathan knows he won’t be left alone unless he gives them what they want. However, he decides to play his own game. After all, he’s a crack shot. He can look after himself – can’t he?