Ran across this book on Amazon, and immediately thought of Effie (duh!). Forwarding just in case you're unaware of it.
"Introduction: The Magnificence of Severus Snape
The Harry Potter series may be named after the Boy Who Lived, but if you want to know the story, keep your eyes fixed on Snape. This hook-nosed, greasy-haired, grumpy character is one of J.K. Rowling’s enduring gifts to English literature. He’s the archetypal ill-tempered teacher: acerbic, yet horribly, deliciously funny. When he’s in a scene, you can’t take your eyes off him. Snape is always the story. In Snape, Rowling created a character of almost perfect ambiguity, a double agent who rose to become the right-hand man of both generals on opposing sides of a war. He’s at once self-controlled and seething with bitterness. Every sentence, every action has at least two possible and contradictory interpretations. The question of Snape’s true loyalties is at the heart of the books’ mysteries. Is it possible, ever, to know what lies underneath his façade? It is. With a close look at each of the books, everything about Snape becomes knowable."
Start reading it for free: http://amzn.to/2e3X1UT -------- Download Kindle for Android, iOS, PC, Mac and more http://amzn.to/1r0LubW