Book excerpt: For years, FBI agents Fox Mulder and Dana Scully toiled in the X-Files Unit, a one-office division of the Bureau dealing with cases deemed unsolvable and related to unexplained phenomena. Eventually, both agents left the FBI and began new lives in peaceful anonymity. However, recent events prompted them to return to the Bureau and the X-Files. Contains the stories "Active Shooter," "Dia De Los Muertos," and "Ismael" from issues #1-5 of The X-Files series.