Four is the magic number in Michael Martone’s Four for a Quarter. In subject–four fifth Beatles, four tie knots, four retellings of the first Xerox, even the sex lives of the Fantastic Four–and in structure–the book is separated into four sections, with each section further divided into four chapterettes–Four for a Quarter returns again and again to its originating number, making chaos comprehensible and mystery out of the most ordinary.