There are quite a few Scala text's available. I would recommend "Programming in Scala" by Martin Odersky as a first text to read upon. You could then pick up the "Scala in Depth" text if you want to go a bit advanced in Scala.
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If you really want a book (I know I like a paper book a lot better) and you are a beginner to intermediate level, I'd recommend Jason Schwarz's Learning Scala since it is incredibly simple and comes in bite-sized chunks.
A much more in-depth book is Functional Programming in Scala by Chiusano and Bjarnesen. This book is worth buying IMO. The approach I would recomend is learn Scala using online resources then get this book to really build on the basics.