[1] On The Edge of the Dark Sea of Darkness is about three siblings, Janner, Tink and Leeli Igiby; their mother, Nia Igiby; their ex-pirate grandfather, Podo Helmer; and the Fangs of Dang.

The Fangs are lizard-like conquerors of the land of Skree whose lives' purpose seems to be to keep all the humans in the land of Skree miserable and unable to fight back, and who serve a mysterious person called Gnag the Nameless.

The first edition book contains two maps, several illustrations, and appendices, including poems and some of the Fangs' bureaucratic forms, all by Peterson.

The fifty-one chapter book has three short prologues describing the different countries as well as an anecdote about how the world got its name.

The Christy Award recognizes novelists and novels of excellence in several genres of Christian fiction.