Mike was found dead at his office desk. Sherlock Holmes was the detective for this case and narrowed the suspects down to three individuals: 1. His closest friend Dan 2. His wife Tiara 3. His personal assistant Jason All three of them had come to meet Mike on the day he was found murdered for different reasons as they told to Sherlock. As ever, where police fails, Sherlock comes to rescue. Witty Sherlock found a footnote at the corner of Mike's table and "7B91011" written on it and Sherlock immediately announced the murderer. Who was the murderer?