This book is one of the gems of the classic beer style series.
Here, the topic is barleywine ... a style that frequently gives both professional and amateur homebrewers fits. The author give good information on various brewing techniques that can help people to master this style - split lautering (for making both barley wine and mild ale from the same mash), wort concentratration/caramelization by long boils, using multiple yeast strains (a base strain for flavor, and other strains for higher attenuation/flocculation), etc.
This book is a must read for any amateur homebrewer who wants to attempt this style with improved chances of success and satisfaction.
p.s. One of my own personal specialities, back when I was still homebrewing regularly, was making clones of Anchor "Old Foghorn". The trick to duplicating that beer (aside from hop & yeast selection) is a touch of maple sugar. That tip is courtesy of yours truly, not Fal Allen.