Why shoot a butler?

the long version

Every family has secrets, but the Fountains' are turning deadly…On a dark night, along a lonely country road, barrister Frank Amberley stops to help a young lady in distress and discovers a sports car with a corpse behind the wheel. The girl protests her innocence, and Amberley believes her—at least until he gets drawn into the mystery and the clues incriminating Shirley Brown begin to add up…In an English country-house murder mystery with a twist, it's the butler who's the victim, every clue complicates the puzzle, and the bumbling police are well-meaning but completely baffled. Fortunately, in ferreting out a desperate killer, amateur sleuth Amberley is as brilliant as he is arrogant, but this time he's not sure he wants to know the truth…