- In-N-Out owner Lynsi Snyder has penned a book titled "The Ins-N-Outs of In-N-Out Burger."
- The billionaire says she plans to reveal 75 years of history in the book, set to be released in October.
- "I have waited so long to tell the true In-N-Out Story," Snyder wrote on her Instagram page.
No other restaurant chain keeps its closely held secrets under wraps more than In-N-Out Burger.