Three Fifths Mysterious Book Report No. 398 by John Dwaine McKenna Dynamite comes in small packages, is an old saw that usually refers to persons of small stature.  But when taken literally, it means that explosive things are humble in size . . . and it’s a spot-on metaphor for this week’s MBR. Three Fifths, (Agora Books, $24.99, 212 pages, ISBN 978-1-947993-67-9) by John Vercher, is a pulsating, daring,