Not since The F.B.I. Story, a book authored by Don Whitehead in the 1950s which spawned a succesful motion picture starring Jimmy Stewart, has an updated version of the career of an F.B.I. agent been written. The work has changed considerably since the publication of that book. Although Mr. Whitehead's version was somewhat void of humor, the authors of this book have taken the liberty to include some of those humorous occurences which surfaced throughout their careers.