The book by marine biologist Helen Scales is dedicated to the most common and mysterious, well-known and in some ways completely unfamiliar creatures - fish. Their fascinatingly interesting life takes place hidden from us, under the surface of the water, in the depths of the ocean, and therefore remains largely underestimated and misunderstood. Fish are far from being such primitive creatures as we imagined them to be - they can count, use tools, comprehend the laws of physics, can solve complex logical problems, have social intelligence and are capable of cooperation. Fish exhibit behaviors that were previously thought to be characteristic only of humans and some large-brained primates. This fascinating, fact-rich book will undoubtedly inspire readers to become more familiar with these amazing creatures and make them think about what they much smarter and live an incomparably more complex and interesting life than is commonly thought.