Lynsi Snyder at replica burger stand.
In-N-Out owner Lynsi Snyder wrote a book about the family business.
  • 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.