You play Adam Jensen, a security specialist, handpicked to oversee the defense of one of Americas most experimental biotechnology firms. But when a black ops team uses a plan you designed to break in and kill the scientists you were hired to protect, everything you thought you knew about your job changes. At a time when scientific advancements are routinely turning athletes, soldiers and spies into super-enhanced beings, someone is working very hard to ensure mankinds evolution follows a particular path, and you need to discover why — the decisions you take and the choices you make, will be the only things that can change it.