Introduces the Greek god Poseidon and explains his importance; features well-known Greek myths about this god; and includes a map of ancient Greece and a family tree of the principal Greek gods. Additional features to aid comprehension include a table of contents, informative sidebars, a list of Greek characters introduced in the text, a list of equivalent Roman gods and goddesses, sources for further research including websites, an index, and an introduction to the author and illustrator.