This 32-page hardcover book is fully illustrated in Heller's signature style -- elaborate details, bright colors, and bold pictures. The Sargasso Sea is a natural mystery. It is a warm "sea within a sea" in the midst of the cold Northern Atlantic Ocean where whirlpool-like currents have been said to becalm ships forever. Underneath huge tangles of seaweed are Men-O-War, jellyfish, turtles, fish, and eels. Each spread elaborately describes and depicts a characteristic of this complex and exciting watery habitat.