Retail is a tough industry. There are low switching costs for customers (though firms try to mitigate this with things like loyalty programs), low barriers to entry, and fixed costs make up a large percentage of overall costs, which means even slight changes in revenue can have large effects on the bottom line. But for these very same reasons, it is also a very interesting/dynamic sector from the perspective of a retailer that is doing well and looking to grow its share.
Because of these factors, standing still as a retailer is a sure way to get beat up by the competition. Retailers must always be looking to improve their operations, and with that in mind there are a number of tactics that retailers can use to improve profits. Smart Retail is a book about a number of these techniques.
The first half of the book was rather useless in my opinion. It's about motivating yourself and your team, working in an area in which you're passionate, and other stuff that really applies to all of life and/or business, not just retail. But the second half made up for it, as it was much more focused on what I was looking for: retail tactics, what works and what doesn't.
To be honest though, I actually much preferred Paco Underhill's Why We Buy on this subject. Unlike this one, it didn't spend a lot of time on the intangible stuff, and did a better job convincing me that the results were gotten through controlled experiments. If you have to pick one, read that one instead. Of course, if you're in retail, you should read them both!