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.