Noun: The aspect of someone's character that is presented to or perceived by others. 
"His public appearance"
"His Persona"

Synonyms: image, face, public face, character,  personality, identity, self, front, façade, mask, guise

It begins with the first book of the four book series:

Growing up in New Orleans under the strict guidance of a deacon with a dark side, it leaves no question as to why he chose the path of crime. his understanding and use of DNA, computer hacking and looking like the guy next door, or whomever he chooses to be, compiles a terrifying character that you will never forget.

 Magda Volkov, is a native Russian who works for the BAU of the FBI, her clairvoyance is something her director has learned to trust and use to their advantage especially now with a seeming "ghost-killer" at hand. the deeper she gets into his psyche, the more they are both surprised when their strange vivid dreams begin to intertwine. 

be careful that their nightmares don't become your own.