The first half of Schultz's Pour Your Heart Into It.

Even its title, similar to Kroc (his: Grind It Out).

Not a book but there’s a good episode of the How I Built This podcast that gives a great overview. https://one.npr.org/?sharedMediaId=551874532:554086519

I really enjoyed Schultz's "Onward," which talks about his return as CEO in 2008 to turn around Starbucks, which was struggling mightily at the time.

Yes, there was a time when Starbucks was not doing well.