Which one was it? A book that you randomly picked up at the library or book store and just loved. Yet, afterward you realized that this book is barely known by anyone despite it being absolutely brilliant. For me, the best unknown book I read was when I was young, "Midnight for Charlie Bone" by Jenny Nimmo. A part of an eight book series called, "The Children of the Red King". I was in absolute love with the series. Yet, barely anyone knew about it. Sad, because it was a terrific read.