Evolution of Black Holes in Anti de Sitter Spacetime and the Firewall Controversy A Century of Black Hole Physics The Mathematical Discovery of Black Holes The Thermodynamics of Black Holes Positive Mass Theorem Stability & Phase Transition Defining Mass in General Relativity Positive Mass and Stability The Euclidean Action Hiscock and Weems Analysis of Charged Black Holes Reissner Nordström Black Hole Revisited The Hiscock and Weems Model Why Hawking Radiation Cannot Be Decoded Information Decoding vs. the Lifetimes of Charged Black Holes Evaporating Charged AdS Black Holes Do Hyper Entropic Objects Exist in Quantum Gravity A Monster is Born Monsters in String Theory. This thesis focuses on the recent firewall controversy surrounding evaporating black holes and shows that in the best understood example concerning electrically charged black holes with a flat event horizon in anti de Sitter (AdS) spacetime the firewall does not arise. The firewall which surrounds a sufficiently old black hole threatens to develop into a huge crisis since it could occur even when spacetime curvature is small which contradicts general relativity. However the end state for asymptotically flat black holes is ill understood since their curvature becomes unbounded. This issue is avoided by working with flat charged black holes in AdS. The presence of electrical charge is crucial since black holes inevitably pick up charges throughout their long lifetime. These black holes always evolve toward extremal limit and are then destroyed by quantum gravitational effects. This happens sooner than the time required to decode Hawking radiation so that the firewall never sets in as conjectured by Harlow and Hayden. Motivated by the information loss paradox the author also investigates the possibility that “monster” configurations might exist with an arbitrarily large interior bounded by a finite surface area. Investigating such an object in AdS shows that in the best understood case such an object much like a firewall cannot exist.