Maurizio Leo's The Perfect Loaf blog is one of the most trusted sourdough resources on the internet. This cookbook is the full version of that work – the techniques, the troubleshooting and the teaching style that made the blog a joy to follow. 

Leo covers sourdough from the ground up. Beginners get troubleshooting guides and step-by-step instruction. More experienced bakers get the science behind fermentation, hydration ratios and freshly milled grains. It's the kind of book that earns a permanent spot on the counter.