When the Donovan Hohn heard of the mysterious loss of thousands of bath toys at sea, he figured he would interview a few oceanographers, talk to a few beachcombers, and read up on Arctic science and geography. But questions can be like ocean currents: wade in too far, and they carry you away. Hohn’s accidental odyssey pulls him into the secretive arena of shipping conglomerates, the daring work of Arctic researchers, the lunatic risks of maverick sailors, and the shadowy world of Chinese toy factories. “Moby-Duck” is a journey into the heart of the sea and an adventure through science, myth, the global economy, and some of the worst weather imaginable.