Over My Dead Body — Raymond Flynn

Someone is blackmailing a local supermarket chain. And getting away
with it, thanks to a very clever payoff method involving hole-in-the-wall
bank machines and a bit of glaring police incompetence. When the
blackmailers descend on Eddathorpe, Robert Graham is called in. He
thinks it's an inside job - and sets out to prove it.

He doesn't know the case is going to escalate from fraud to murder; or
that its unravelling could change his life...