Elementary: Blood and Ink by Adam Christopher

The CFO of a secretive NYC hedge fund is found murdered—stabbed through the eye with an expensive fountain pen. Holmes and Watson discover a link between the victim and a charismatic touring management guru with a doubtful past. But is the solution so clear-cut or is the guru being framed? As secrets are revealed and another victim is found murdered in the same grisly fashion, Holmes and Watson begin to uncover a murky world of money and deceit...