Sarah Shelley and the Deadly Aperitifs: The Obsession of Doctor Pendergrass (The Obsession of Dr. Pendergrass Book 3) by John David Buchanan

Stunned by what she read in the newspaper article, Sarah Shelley sat quietly in disbelief. The past, so conveniently tucked away from her memory, came crashing back into her mind. Now she knew the truth. Whoever was responsible had no idea she was coming for them. All Silas Morgan could think about was getting even. That’s all he ever thought about. From the time he entered primary school, he was picked on, bullied and ridiculed and laughed at. The torturous treatment continued, even after he entered Eton. In fact, it got worse; if that were possible. When he was young, getting even was simple, like putting dirt in someone’s drink when they weren’t looking. But at Eton, the hazing had become much more personal and intense. On more than one occasion Silas had been embarrassed by a group of entitled prats acting like they were better than everyone else. So, getting even had to reach a new level of sophistication and severity. Recalling a particularly dreadful event, Silas seized upon the perfect scheme; one that would put an end to his misery once and for all. He simply had to commit murder.