the question of where to start is a tricky one because her story isn't really about a 'book' in the traditional sense, as she hasn't authored a published memoir herself. The most direct entry point is probably Nancy Grace's 'Objection!: How High-Priced Defense Attorneys, Celebrity Defendants, and a 24/7 Media Have Hijacked Our Criminal Justice System.' There's a chapter in there that details her case extensively. It's a really difficult read, obviously, given the nature of what she survived, but it's presented within the context of the legal and media circus that followed.
If you're coming at this from a true crime interest, that's likely the most cited source. But honestly, I'd caution anyone diving in. The material is extremely heavy, and focusing on the 'most popular' aspect feels a bit off. Her story is one of profound survival, not entertainment. I remember reading news coverage years ago and it just sticks with you in a way that fictional crime never could.
For a more narrative, book-length treatment, you'd have to look at works by journalists covering the case, but no single title stands as 'the' Shasta Groene book. It's more about piecing together the story from court documents, interviews, and those dedicated chapters in true crime anthologies. The 'popularity' is tied to the notoriety of the case itself, not a bestseller list.