Which book series has been turned into tv series?

I'm trying to find a book series I saw someone reading on train. i didn't get title. I heard the reader speaking with someone about it. it's a 6 book series, she was reading book 4 which is gold in color %26amp; it's a tv series. it was paperback %26amp; thick. I thought maybe a game of thrones but the book didn't look the same as the one the lady had. the back had a "burgundy/maroon" color stripe on top of the back of the book. I hope this sounds familiar to anyone.Which book series has been turned into tv series?
Could it be Dexter?Which book series has been turned into tv series?
Dexter and friends.

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