Murder by Committee (Ellie Quicke Mysteries)

It seemed an innocent request: would widowed Ellie Quicke visit a man whose dog had died in an accident? The dog's master - a powerful but unpleasant business tycoon - believes he was the intended target, and that an old enemy is responsible. Ellie discovers the tycoon has made more enemies than the government, though not all of them are as helpless as they seem.